Fair Value, Inputs, Level 1 [Member] Fair Value, Hierarchy [Axis] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Employee Stock Option [Member] Antidilutive Securities [Axis] Warrant [Member] Land Improvements [Member] Property, Plant and Equipment, Type [Axis] Building and Building Improvements [Member] Machinery and Equipment [Member] Furniture and Fixtures [Member] Computer Equipment and software [Member] Transportation Equipment [Member] Term loan 1 Debt Instrument [Axis] Term loan 2 Line of Credit Line of Credit 2 Line of Credit 3 Term Loan 3 Note payable 1 Note payable 2 US Bank loans China Banks Taiwan bank Cost of Sales [Member] Income Statement Location [Axis] Research and Development Expense [Member] Selling and Marketing Expense [Member] General and Administrative Expense [Member] Minimum Range [Axis] Maximum 2013 Plan Plan Name [Axis] 1998 Plan 2000 Plan 2004 Plan 2006 Plan Series A Preferred Stock [Member] Class of Stock [Axis] Series C Preferred Stock [Member] Series D Preferred Stock [Member] Series E Preferred Stock [Member] Series F Preferred Stock [Member] Series G Preferred Stock [Member] UNITED STATES Geographical [Axis] TAIWAN CHINA Restricted Stock [Member] Line of Credit 4 Line of Credit 5 China, Yuan Renminbi Currency [Axis] United States of America, Dollars Prior Plans Award Type [Axis] Document And Entity Information Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Is Entity a Well-known Seasoned Issuer? Is Entity a Voluntary Filer? Is Entity's Reporting Status Current? Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Period Focus Document Fiscal Year Focus Statement of Financial Position [Abstract] ASSETS Current Assets Cash and cash equivalents Restricted cash Short-term investments Accounts receivable - trade, net Inventories Prepaid expenses and other current assets Total current assets Property, plant and equipment, net Land use rights, net Intangible assets, net Other assets, net TOTAL ASSETS LIABILITIES AND STOCKHOLDERS' EQUITY Current liabilities Current portion of notes payable and long-term debt Accounts payable Bank acceptance payable Accrued liabilities Total current liabilities Notes payable and long-term debt, less current portion Other long term liabilities TOTAL LIABILITIES Stockholders' equity (deficit): Redeemable Convertible Preferred Stock and Convertible Preferred Stock; 5,000 shares authorized; no shares issued and outstanding at March 31, 2014 and December 31, 2013, $0.001 par value Common Stock; 45,000 shares authorized; 14,730 shares issued and outstanding at March 31, 2014, $0.001 par value; 12,644 shares issued and outstanding at December 31, 2013, $0.001 par value Additional paid-in capital Accumulated other comprehensive gain Accumulated deficit TOTAL STOCKHOLDERS' EQUITY TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Convertible Preferred Stock par value Convertible Preferred Stock shares authorized Convertible Preferred Stock shares issued Convertible Preferred Stock shares outstanding Common stock par value Common stock shares authorized Common stock shares issued Common stock shares outstanding Income Statement [Abstract] Revenue, net Cost of goods sold Gross profit Operating expenses Research and development Sales and marketing General and administrative Total operating expenses Income (loss) from operations Other income (expense) Interest income Interest expense Other expense, net Total other expense Income (loss) before income taxes Income taxes Net income (loss) Net income (loss) per share - basic Net income (loss) per share - diluted Weighted average shares used to compute net income (loss) per share - basic Weighted average shares used to compute net income (loss) per share - diluted Pro forma net income (loss) per share - basic Pro forma net income (loss) per share - diluted Pro forma weighted average shares used to compute net income (loss) per share - basic Pro forma weighted average shares used to compute net income (loss) per share - diluted Statement of Comprehensive Income [Abstract] Net income (loss) Foreign currency translation adjustment, net of tax Comprehensive loss Statement of Cash Flows [Abstract] Operating activities: Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Provision for obsolete inventory Depreciation and amortization Loss (Gain) on disposal of assets Share-based compensation and warrant expense Changes in operating assets and liabilities: Accounts receivable Bank acceptance receivable Inventory Other current assets Accounts payable Accrued liabilities Net cash provided by (used in) operating activities Investing activities: Purchase of property, plant and equipment Proceeds from disposal of equipment Deposits and deferred charges Purchase of intangible assets Net cash used in investing activities Financing activities: Proceeds from issuance of notes payable and long-term debt Principal payments of long-term debt and notes payable Proceeds from line of credit borrowings Repayments of line of credit borrowings Proceeds from bank acceptance payable Repayments of bank acceptance payable Repayments of shareholder loans Increase in restricted cash Exercise of stock options Exercise of warrants Deferred offering costs Proceeds from public offering Net cash provided by (used in) financing activities Effect of exchange rate changes on cash Net increase (decrease) in cash Cash and cash equivalents at beginning of the period Cash and cash equivalents at end of the period Supplemental disclosure of cash flow information: Cash paid for: Interest Income taxes Organization, Consolidation and Presentation of Financial Statements [Abstract] 1. Description of Business Accounting Policies [Abstract] 2. Significant Accounting Policies Fair Value Disclosures [Abstract] 3. Fair Value of Financial Instruments Earnings Per Share [Abstract] 4. Earnings Per Share Inventory Disclosure [Abstract] 5. Inventory Property, Plant and Equipment [Abstract] 6. Property, Plant and Equipment Debt Disclosure [Abstract] 7. Notes Payable and Long-Term Debt Payables and Accruals [Abstract] 8. Accrued Liabilites Other Income and Expenses [Abstract] 9. Other Income and Expense Disclosure of Compensation Related Costs, Share-based Payments [Abstract] 10. Share-Based Compensation Equity [Abstract] 11. Stockholders' Equity Segment Reporting [Abstract] 12. Segment and Geographic Information Subsequent Events [Abstract] 13. Subsequent Events Recent accounting pronouncements Use of Estimates Schedule of assets and liabilities at fair value Computation of basic and diluted net loss per share Schedule of potentially dilutive securites Schedule of inventories Schedule of property, plant and equipment Schedule of notes payable and long-term debt Schedule of accrued liabilities Schedule of other income and expense Schedule of employee stock-based compensation expenses Summary of option activity Revenue and asset information by geographic region Statement [Table] Statement [Line Items] Assets: Cash and cash equivalents Restricted cash Short term investments Total assets Liabilities: Total liabilities Numerator: Denominator: Weighted average shares used to compute net income (loss) per share Basic Effective of dilutive options and warrants Diluted Net income (loss) per share Basic Diluted Potentially dilutive securires excluded from computation of diluted net income (loss) per share Inventory Details Raw materials Work in process Finished goods Inventories Inventory Details Narrative Lower of cost or market adjustment for inventory Property, plant and equipment, gross Less accumulated depreciation and amortization Property, plant and equipment Land Property, plant and equipment, net Property Plant And Equipment Details Narrative Depreciation expense Notes payable and long-term debt total Long term portion of notes payable and long-term debt Bank acceptance notes Debt maturity date Interest rate Unused borrowing capacity Revolving line of credit amount outstanding Revolving line of credit maximum borrowing capacity Revolving line of credit, maturity date Interest rate on line of credit Warrants outstanding Amount remains to be expensed for warrants Accrued Liabilities Details Accrued payroll Accrued employee benefits Accrued taxes Accrued interest Accrued payments Accrued commission Accrued professional fees Accrued other Total accrued liabilities Other Income And Expense Details Interest income Unrealized foreign exchange gain (loss) Realized foreign exchange gain (loss) Government subsidy income Other non-operating gain (loss) Gain (loss) on disposal of assets Total other income and expense Employee stock-based compensation expense Number of Shares Outstanding, beginning balance Granted Exercised Forfeited Expired Outstanding, ending balance Exericsable, ending balance Vested and expected to vest Weighted Average Exercise Price Outstanding, beginning balance Granted Exercised Forfeited Expired Outstanding, ending balance Exericsable, ending balance Vested and expected to vest Common stock shares available to purchase Weighted average exercise price of option outstanding Compensation cost on unvested options not yet recognized Compensation cost unrecognized weighted average period Aggregate intrinsic value of options outstanding Aggregate intrinsic value of options exercisable Share based compensation Deferred compensation expense Stock sold in public offering, shares Stock sold in public offering, proceeds Revenues Long-lived assets Cash paid for Number of Shares Weighted Average Exercise Price Numerator Denominator Weighted average shares used to compute net income (loss) per share Accrued payments Accrued commission Government subsidy income Restricted cash fair value disclosure Common stock shares available to purchase Assets, Current Assets Liabilities, Current Liabilities Stockholders' Equity Attributable to Parent Liabilities and Equity Gross Profit Operating Expenses Operating Income (Loss) Interest and Other Income Other Nonoperating Income (Expense) Other Nonoperating Expense Income Tax Expense (Benefit) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Increase (Decrease) in Accounts Receivable Increase (Decrease) in Accounts and Other Receivables Increase (Decrease) in Inventories Increase (Decrease) in Other Current Assets Increase (Decrease) in Accounts Payable Increase (Decrease) in Accrued Liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Increase (Decrease) in Deferred Charges Payments to Acquire Intangible Assets Net Cash Provided by (Used in) Investing Activities, Continuing Operations Repayments of Debt Repayments of Lines of Credit Repayments of Bank Debt Repayments of Related Party Debt Increase (Decrease) in Restricted Cash Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Adjustment Net Cash Provided by (Used in) Financing Activities, Continuing Operations Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents, Fair Value Disclosure RestrictedCashAndCashEquivalentsFairValueDisclosure Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, Plant and Equipment, Other, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price