Rubicon Technology (RBCN) 10-K 14 Mar 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Mar. 09, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	RBCN
Entity Registrant Name	RUBICON TECHNOLOGY, INC.
Entity Central Index Key	1,410,172
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		26,722,958
Entity Public Float			$ 23,709,896

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 21,216	$ 24,353
Restricted cash	170	183
Short-term investments	8,895	20,562
Accounts receivable, net	1,738	8,323
Inventories	21,333	22,739
Other inventory supplies	5,717	8,208
Prepaid expenses and other current assets	1,188	1,035
Total current assets	60,257	85,403
Property and equipment, net	57,569	107,676
Other assets	1,416	1,827
Total assets	119,242	194,906
Liabilities and stockholders' equity
Accounts payable	3,256	3,754
Accrued payroll	164	514
Accrued and other current liabilities	1,328	925
Corporate income and franchise taxes	207	270
Accrued real estate taxes	238	280
Short-term loan payable	1,500
Advance payments	9	10
Total current liabilities	6,702	5,753
Deferred tax liability	554	593
Total liabilities	$ 7,256	$ 6,346
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.001 par value, 5,000,000 undesignated shares authorized, no shares issued or outstanding
Common stock, $0.001 par value, 40,000,000 shares authorized; 28,007,811 and 27,913,788 shares issued; 26,232,967 and 26,138,944 shares outstanding	$ 28	$ 28
Additional paid-in capital	373,565	372,319
Treasury stock, at cost, 1,774,844 shares	(12,148)	(12,148)
Accumulated other comprehensive loss	(33)	(43)
Accumulated deficit	(249,426)	(171,596)
Total stockholders' equity	111,986	188,560
Total liabilities and stockholders' equity	$ 119,242	$ 194,906

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	28,007,811	27,913,788
Common stock, shares outstanding	26,232,967	26,138,944
Treasury stock, shares	1,774,844	1,774,844

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	$ 23,818	$ 45,685	$ 41,513
Cost of goods sold	46,961	75,372	63,434
Gross loss	(23,143)	(29,687)	(21,921)
Operating expenses:
General and administrative	9,589	9,863	8,629
Sales and marketing	1,363	1,468	1,521
Research and development	2,210	1,861	2,263
Long-lived asset impairment charge	39,597
Loss on disposal of assets	47	734	550
Loss from operations	(75,949)	(43,613)	(34,884)
Other income (expense):
Interest income	71	86	51
Interest expense	(109)	(95)	(95)
Realized loss on foreign currency translation	(1,869)	(551)	(583)
Realized gain on investments		258
Total other expense	(1,907)	(302)	(627)
Loss before income taxes	(77,856)	(43,915)	(35,511)
Income tax (expense) benefit	26	(78)	5,160
Net loss	$ (77,830)	$ (43,993)	$ (30,351)
Net loss per common share
Basic	$ (2.98)	$ (1.70)	$ (1.35)
Diluted	$ (2.98)	$ (1.70)	$ (1.35)
Weighted average common shares outstanding used in computing net loss per common share
Basic	26,156,170	25,815,405	22,572,212
Diluted	26,156,170	25,815,405	22,572,212

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (77,830)	$ (43,993)	$ (30,351)
Other comprehensive income (loss):
Unrealized gain (loss) on investments, net of taxes	10	(9)	(863)
Unrealized loss on currency translation		(4)	(2)
Reclassification of unrealized gain included in net loss	0	388
Other comprehensive income (loss)	10	375	(865)
Comprehensive loss	$ (77,820)	$ (43,618)	$ (31,216)

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional paid-in Capital [Member]	Accum Other Comp Inc. [Member]	Accum deficit [Member]
Beginning Balance at Dec. 31, 2012	$ 225,386	$ 25	$ (12,148)	$ 334,314	$ 447	$ (97,252)
Beginning Balance, Shares at Dec. 31, 2012		24,327,140
Beginning Balance, Treasury Shares at Dec. 31, 2012			(1,774,844)
Exercise of stock options	$ 140			140
Exercise of stock options, Shares	27,930	27,930
Stock-based compensation	$ 1,246			1,246
Restricted stock issued	292			292
Restricted stock issued, shares		73,707
Excess tax benefit of stock based compensation	(114)			(114)
Stock issued to Board of Directors	57			57
Stock issued to Board of Directors, Shares		4,746
Foreign currency translation adjustments	(2)				(2)
Unrealized (gain) loss on investments, net of tax	(863)				(863)
Net loss	(30,351)					(30,351)
Ending Balance at Dec. 31, 2013	195,791	$ 25	$ (12,148)	335,935	(418)	(127,603)
Ending Balance, Shares at Dec. 31, 2013		24,433,523
Ending Balance, Treasury Shares at Dec. 31, 2013			(1,774,844)
Exercise of stock options	$ 256			256
Exercise of stock options, Shares	47,654	47,654
Stock-based compensation	$ 960			960
Restricted stock issued, net of unvested restricted stock cancelled	448			448
Restricted stock issued, net of unvested restricted stock cancelled, Shares		7,013
Common stock issued, net of shares withheld for employee taxes	(55)			(55)
Common stock issued, net of shares withheld for employee taxes, Shares		3,098
Common stock issued, net of issuance costs	34,778	$ 3		34,775
Common stock issued, net of issuance costs, Shares		3,422,500
Reclassification of unrealized gain included in net loss	388				388
Foreign currency translation adjustments	(4)				(4)
Unrealized (gain) loss on investments, net of tax	(9)				(9)
Net loss	(43,993)					(43,993)
Ending Balance at Dec. 31, 2014	$ 188,560	$ 28	$ (12,148)	372,319	(43)	(171,596)
Ending Balance, Shares at Dec. 31, 2014		27,913,788
Ending Balance, Treasury Shares at Dec. 31, 2014	(1,774,844)		(1,774,844)
Exercise of stock options	$ 4			4
Exercise of stock options, Shares	5,692	5,692
Stock-based compensation	$ 731			731
Restricted stock issued, net of restricted shares withheld for employee taxes	287			287
Restricted stock issued, net of restricted shares withheld for employee taxes, Shares		58,899
Common stock issued, net of shares withheld for employee taxes	224			224
Common stock issued, net of shares withheld for employee taxes, Shares		29,432
Unrealized (gain) loss on investments, net of tax	10				10
Net loss	(77,830)					(77,830)
Ending Balance at Dec. 31, 2015	$ 111,986	$ 28	$ (12,148)	$ 373,565	$ (33)	$ (249,426)
Ending Balance, Shares at Dec. 31, 2015		28,007,811
Ending Balance, Treasury Shares at Dec. 31, 2015	(1,774,844)		(1,774,844)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net loss	$ (77,830)	$ (43,993)	$ (30,351)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities
Depreciation and amortization	11,404	13,637	12,660
Net loss on disposal of assets	47	734	550
Stock-based compensation	1,250	1,408	1,595
Long-lived asset impairment charge	39,597
Realized gain on investments		(258)
Deferred taxes	(39)	72	(5,166)
Excess tax benefits from stock-based compensation			114
Changes in operating assets and liabilities:
Accounts receivable	6,585	(4,752)	9,098
Inventories	73	11,312	12,979
Other inventory supplies	2,166	4,203	2,976
Prepaid expenses and other assets	275	(794)	1,571
Accounts payable	(247)	(637)	(4,472)
Accrued payroll	(323)	153	(510)
Corporate income and franchise taxes	(63)	80	(25)
Accrued real estate taxes	(41)	(56)	39
Advance payments	(1)	(398)	(364)
Accrued and other current liabilities	431	67	(282)
Net cash (used in) provided by operating activities	(16,716)	(19,222)	412
Cash flows from investing activities
Purchases of property and equipment	(941)	(6,842)	(8,721)
Proceeds from disposal of assets		15	141
Purchase of investments	(2,322)	(28,805)	(2,040)
Proceeds from sale of investments	14,000	22,700	11,390
Net cash provided by (used in) investing activities	10,737	(12,932)	770
Cash flows from financing activities
Proceeds from exercise of options	4	256	140
Restricted cash	13	(18)	6
Net change in short-term borrowings	1,500
Proceeds from public offering, net of issuance costs		34,957
Taxes paid related to net share settlement of equity awards	(8)	(55)
Excess tax benefits (Deficiency) from stock-based compensation			(114)
Net cash provided by financing activities	1,509	35,140	32
Net effect of currency translation	1,333	296	284
Net (decrease) increase in cash and cash equivalents	(3,137)	3,282	1,498
Cash and cash equivalents, beginning of year	24,353	21,071	19,573
Cash and cash equivalents, end of year	21,216	24,353	21,071
Supplemental disclosure of cash flow information
Cash paid for interest	$ 109	$ 95	$ 87

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Description of business Rubicon Technology, Inc., a Delaware corporation (the “Company”), is an electronic materials provider that develops, manufactures and sells monocrystalline sapphire and other innovative crystalline products for LEDs, RFICs, optoelectronics and other optical applications. The Company sells its products on a global basis to customers in Asia, Australia, North America and Europe. The Company maintains its operating facilities in the Chicago metropolitan area and in Penang, Malaysia. Principles of consolidation The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, Rubicon Worldwide LLC, Rubicon Sapphire Technology (Malaysia) SDN BHD, Rubicon Technology Hong Kong Limited and Rubicon Technology Korea Yuhan Hosea. All intercompany transactions and balances have been eliminated in consolidation. A summary of the Company’s significant accounting policies applied in the preparation of the accompanying consolidated financial statements follows. Cash and cash equivalents The Company considers all unrestricted highly liquid investments immediately available to be cash equivalents. Cash equivalents primarily consist of time deposits with banks, unsettled trades and brokerage money market accounts. Restricted cash A summary of the Company’s restricted cash at December 31, 2015 and 2014 is as follows: As of December 31, 2015 2014 (in thousands) Certificates of deposit $ 5 $ 5 Flexible spending funds 2 4 Fixed deposit pledge 163 174 $ 170 $ 183 Foreign currency translation and transactions Rubicon Worldwide LLC, Rubicon Technology Hong Kong Limited and Rubicon Technology Korea Yuhan Hosea’s assets and liabilities are translated into U.S. dollars at exchange rates existing at the respective balance sheet dates and capital accounts at historical exchange rates. The results of operations are translated into U.S. dollars at the average exchange rates during the respective period. Translation adjustments resulting from fluctuations in exchange rates for Rubicon Worldwide LLC, Rubicon Technology Hong Kong Limited and Rubicon Technology Korea Yuhan Hosea are recorded as a separate component of accumulated other comprehensive income (loss) within stockholders’ equity. The Company has determined that the functional currency of Rubicon Sapphire Technology (Malaysia) SDN BHD is the U.S. dollar. Rubicon Sapphire Technology (Malaysia) SDN BHD’s assets and liabilities are translated into U.S. dollars using the remeasurement method. Non-monetary assets are translated at historical exchange rates and monetary assets are translated at exchange rates existing at the respective balance sheet dates. Translation adjustments for Rubicon Sapphire Technology (Malaysia) SDN BHD are included in determining net income (loss) for the period. The results of operations are translated into U.S. dollars at the average exchange rates during the respective period. The Company records these gains and losses in other income (expense). Foreign currency transaction gains and losses are generated from the effects of exchange rate changes on transactions denominated in a currency other than the functional currency of the Company, which is the U.S. dollar. Gains and losses on foreign currency transactions are generally required to be recognized in the determination of net income (loss) for the period. The Company records these gains and losses in other income (expense). Investments The Company invests available cash primarily in investment grade commercial paper, FDIC guaranteed certificates of deposit, common stock, corporate notes and government securities. Investments classified as available-for-sale securities are carried at fair market value with unrealized gains and losses recorded in accumulated other comprehensive income (loss). Investments in trading securities are reported at fair value, with both realized and unrealized gains and losses recorded in other income (expense), in the consolidated statements of operations. Investments in which the Company has the ability and intent, if necessary, to liquidate in order to support its current operations, are classified as short-term. The Company reviews its available-for-sale securities investments at the end of each quarter for other-than-temporary declines in fair value based on the specific identification method. The Company considers various factors in determining whether an impairment is other-than-temporary, including the severity and duration of the impairment, changes in underlying credit ratings, forecasted recovery, its ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value and the probability that the scheduled cash payments will continue to be made. When the Company concludes that an other-than-temporary impairment has resulted, the difference between the fair value and carrying value is written off and recorded as a charge on the consolidated statements of operations. As of December 31, 2015 and 2014, no impairment was recorded. Treasury Stock The Company records treasury stock purchases under the cost method whereby the entire cost of the acquired stock is recorded as treasury stock. Accounts receivable The majority of the Company’s accounts receivable is due from manufacturers serving the light-emitting diodes (“LED”) and optical systems and specialty devices industries. Credit is extended based on an evaluation of the customer’s financial condition. Accounts receivable are due based on contract terms and at stated amounts due from customers, net of an allowance for doubtful accounts. Accounts outstanding longer than the contractual payment terms are considered past due. The Company determines its allowance by considering a number of factors, including the length of time a customer’s account is past due, the customer’s current ability to pay and the condition of the general economy and industry as a whole. The Company writes off accounts receivable when they are deemed uncollectible and such write-offs, net of payments received, are recorded as a reduction to bad debt expense. The following table shows the activity of the allowance for doubtful accounts: Year ended December 31, 2015 2014 (in thousands) Beginning balance $ 140 $ 50 Charges to costs and expenses 235 105 Accounts charged off, less recoveries 14 (15 ) Ending balance $ 389 $ 140 Inventories Inventories are valued at the lower of cost or market. Raw materials cost is determined using the first-in, first-out method, and work-in-process and finished goods costs are determined on a weighted-average cost basis which includes materials, labor and overhead. The Company reduces the carrying value of its inventories for differences between the cost and the estimated net realizable value, taking into account usage, expected demand, technological obsolescence and other information. Inventories are composed of the following: As of December 31, 2015 2014 (in thousands) Raw materials $ 7,346 $ 14,503 Work in progress 9,920 6,357 Finished goods 4,067 1,879 $ 21,333 $ 22,739 The Company establishes inventory reserves when conditions exist that suggest inventory may be in excess of anticipated demand or is obsolete based on customer required specifications. The Company evaluates the ability to realize the value of our inventory based on a combination of factors, including forecasted sales, estimated current and future market value and changes in customers’ product specifications. For the years ended December 31, 2015, 2014 and 2013, the Company determined it had inventory that was excess or obsolete and recorded an adjustment which reduced inventory and increased costs of goods sold by $202,000, $2.4 million and $604,000, respectively. The Company has accepted sales orders for core and wafer products at prices lower than cost during 2015, 2014 and 2013. Based on these sales prices, the Company recorded during the years ended December 31, 2015, 2014 and 2013, a lower of cost or market adjustment which reduced inventory and increased cost of goods sold by $3.9 million, $1.7 million and $421,000, respectively. For the three months ended December 31, 2015, a significant sequential decrease in pricing resulted in a lower of cost or market adjustment of $2.8 million that decreased inventory and increased costs of goods sold for the period. This significant pricing decline in the fourth quarter 2015 triggered the Company to review its raw material inventory valuation. Based on the Company’s review of the current outlook of volume and pricing, the Company determined its current cost to produce its own raw material best reflected the replacement cost. As a result of this assessment for the year ended December 31, 2015, the Company recorded an adjustment which reduced its raw material inventory and increased its costs of goods sold by $2.2 million. Property and equipment Property and equipment consisted of the following: As of December 31, 2015 2014 (in thousands) Land and land improvements $ 4,133 $ 4,133 Buildings 26,097 32,482 Machinery, equipment and tooling 50,364 127,158 Leasehold improvements 7,141 7,640 Furniture and fixtures 816 961 Information systems 1,105 1,140 Construction in progress 1,327 3,734 Total cost 90,983 177,248 Accumulated depreciation and amortization (33,414 ) (69,572 ) Property and equipment, net $ 57,569 $ 107,676 Property and equipment are carried at cost and depreciated over their estimated useful lives using the straight-line method. The cost of maintenance and repairs is charged to expense as incurred. Significant renewals and improvements are capitalized. Depreciation and amortization expense associated with property and equipment was $11.4 million, $13.6 million and $12.7 million for the years ended December 31, 2015, 2014 and 2013, respectively. Construction in progress includes costs associated with the construction of furnaces and deposits made on equipment purchases. The estimated useful lives are as follows: Asset description Life Buildings 39 years Machinery, equipment and tooling 3-10 years Leasehold improvements Lesser of life of lease or economic life Furniture and fixtures 7 years Information systems 3 years Other assets The Company’s other assets include overhaul costs that are accounted for using the deferral method. These overhaul costs are recorded at cost on the balance sheet as other assets and are amortized over terms in accordance with their respectful useful lives. Warranty cost The Company’s sales terms include a warranty that its products will meet certain specifications. The Company records a current liability for the expected cost of warranty-related claims at the time of sale. The warranty reserve is included in accrued and other current liabilities on the consolidated balance sheets. The following table presents changes in the Company’s product warranty liability: Year ended 2015 2014 (in thousands) Balance, beginning of period $ 97 $ 141 Charged to cost of sales 90 407 Actual product warranty expenditures (114 ) (451 ) Balance, end of period $ 73 $ 97 Fair value of financial instruments The Company’s financial instruments consist primarily of cash and cash equivalents, short-term investments, accounts receivable, and accounts payable. The carrying values of these assets and liabilities approximate their fair values due to the short-term nature of these instruments at December 31, 2015 and 2014. Concentration of credit risks and other risks and uncertainties Financial instruments that could potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. At December 31, 2015 and 2014, the Company had $2.9 million and $1.5 million, respectively, on deposit at financial institutions in excess of amounts insured by the Federal Deposit Insurance Corporation and other foreign governmental insurance agencies. The Company performs a periodic evaluation of these institutions for relative credit standing. The Company has not experienced any losses in such accounts and management believes it is not exposed to any significant risk of loss on these balances. The Company currently depends on a small number of suppliers for certain raw materials, components, services and equipment, including key materials such as aluminum oxide powder and certain furnace components. If the supply of these components were to be disrupted or terminated, or if these suppliers were unable to supply the quantities of raw materials required, the Company may have difficulty in finding, or may be unable to find, alternative sources for these items. As a result, the Company may be unable to meet the demand for its products, which could have a material adverse impact on the Company. Concentration of credit risk related to revenue and accounts receivable is discussed in Note 4. Revenue recognition Revenues recognized include product sales and billings for costs and fees for government contracts. Product Sales The Company recognizes revenue from product sales when earned. Revenue is recognized when, and if, evidence of an arrangement is obtained and the other criteria to support revenue recognition are met, including: • Persuasive evidence of an arrangement exists • Title has passed and the product has been delivered. • The price is fixed or determinable • Collection of the resulting receivable is reasonably assured. Government Contracts The Company recognizes research and development revenue in the period during which the related costs are incurred over the contractually defined period. In July 2012, the Company signed a contract with the Air Force Research Laboratory to produce large-area sapphire windows on a cost plus fixed fee basis. The Company records revenue on a gross basis as costs are incurred plus a portion of the fixed fee. For the years ended December 31, 2015, 2014, and 2013, $661,000, $689,000 and $1.4 million, respectively of revenue were recorded. To date, the Company has recorded $4.0 million in revenue and the total value of the contract is $4.7 million. The Company does not provide maintenance or other services and it does not have sales that involve multiple elements or deliverables. Shipping and handling costs The Company records costs incurred in connection with shipping and handling of products as cost of goods sold. Amounts billed to customers in connection with these costs are included in revenue and are not material for any of the periods presented in the accompanying financial statements. Sales tax The Company collects and remits sales taxes on products sold to customers and reports such amounts under the net method in its consolidated statements of operations and records a liability until remitted to the respective tax authority. Stock-based compensation The Company requires all share-based payments to employees, including grants of employee stock options to be measured at fair value and expensed in the consolidated statements of operations over the service period (generally the vesting period) of the grant. Expense is recognized in the consolidated statements of operations for these share-based payments. Research and development Research and development costs are expensed as incurred. Research and development expense was $2.2 million, $1.9 million and $2.3 million for the years ended December 31, 2015, 2014 and 2013, respectively. Accounting for uncertainty in income taxes The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such positions are then measured based on the largest benefit that has a greater than 50% likelihood of being realized upon settlement. The Company recognizes interest and/or penalties related to income tax matters in income tax expense. There were no interest or penalties related to income taxes that have been accrued or recognized as of and for the years ended December 31, 2015 and 2014. The Company is subject to taxation in the U.S., Japan and in a state jurisdiction. The Company is exempt from Malaysian income tax for a five year period beginning in 2009 with a five year renewal. Due to the existence of net operating loss carryforwards, tax years ended December 31, 2001 through 2006, 2008, 2009 and 2011 through 2014 are open to examination by tax authorities for Federal purposes. Due to net operating loss carryforwards at the State level, tax years ended 2004 through 2006 and 2008 through 2014 are open to examination by state tax authorities. Tax years 2013 and 2014 are open to examination by tax authorities in Malaysia. Income taxes Deferred tax assets and liabilities are provided for temporary differences between financial reporting and income tax bases of assets and liabilities, and are measured using the enacted tax rates and laws expected to be in effect when the differences will reverse. Deferred income taxes also arise from the future benefits of net operating loss carryforwards. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. Full valuation allowances on net deferred tax assets are maintained until an appropriate level of profitability that generates taxable income is deemed sustainable or until a tax strategy is developed that would enable the Company to conclude that it is more likely than not that a portion of the deferred tax assets will be realizable. Based on an evaluation in accordance with the accounting standards, as of December 31, 2015 and 2014, a valuation allowance has been recorded against the net U.S. deferred tax assets in order to measure only the portion of the deferred tax assets that are more likely than not to be realized based on the weight of all the available evidence. Use of estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Other comprehensive loss Comprehensive loss is defined as the change in equity of a business enterprise from transactions and other events from non-owner sources. Comprehensive loss includes net loss and other non-owner changes in equity that bypass the statement of operations and are reported in a separate component of equity. A summary of the components of comprehensive loss for the years ended December 31, 2015 and 2014 follows: Year Ended December 31, 2015 2014 (in thousands) Reclassification of unrealized gain included in net loss $ — $ 388 Unrealized loss on investments, net of tax (17 ) (415 ) Unrealized loss on currency translation (16 ) (16 ) Ending Balance $ (33 ) $ (43 ) Net income (loss) per common share Basic net income (loss) per share is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is computed by dividing net income (loss) by the weighted average number of diluted common shares outstanding during the period. Diluted shares outstanding are calculated by adding to the weighted shares outstanding any common stock equivalents, outstanding stock options and warrants based on the treasury stock method. Diluted net loss per common share is the same as basic net loss per common share for the years ended December 31, 2015 and 2014, because the effects of potentially dilutive securities are anti-dilutive. As of December 31, 2015, diluted shares outstanding were the same as basic shares outstanding. The number of anti-dilutive shares excluded from the calculation of diluted net loss per share is as follows as of December 31, 2014: 2014 Warrants 46,290 Stock options 4,146 50,436 Recent accounting pronouncements In May 2014, the FASB issued ASU No. 2014-09 (“ASU 2014-09”), Revenue from Contracts with Customers In June 2014, the FASB issued ASU No. 2014-12 (“ASU 2014-12”), Compensation – Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period In August 2014, the FASB issued ASU 2014-15 (“ASU 2014-15”), Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern In April 2015, the FASB issued ASU 2015-03 (“ASU 2015-03”), Simplifying the Presentation of Debt Issuance Costs . Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements In July 2015, the FASB issued ASU No. 2015-11 (“ASU 2015-11”), Inventory (Topic 330): Simplifying the Measurement of Inventory. In November 2015, the FASB issued ASU 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes In January 2016, the FASB issued ASU 2016-01 (“ASU 2016-01”), Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost. These changes become effective for fiscal years beginning after December 15, 2017. The Company is evaluating the impact, if any, of adopting ASU 2016-01 on its financial statements.

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Segment Information	2. SEGMENT INFORMATION The Company has determined that it operates in only one segment as it only reports profit and loss information on an aggregate basis to its chief operating decision maker. Revenue is attributed by geographic region based on ship-to location of the Company’s customers. The following table summarizes revenue by geographic region: Year Ended December 31, 2015 2014 2013 (in thousands) China $ 5,499 $ 19,857 $ 14,844 United States 4,894 5,452 4,444 Germany 3,718 925 436 Korea 3,646 5,001 2,214 Taiwan 3,490 9,843 7,361 Australia 913 716 10,368 Israel 785 1,169 455 Canada 522 976 337 Japan 342 1,517 309 Other 9 229 745 Revenue $ 23,818 $ 45,685 $ 41,513 The following table summarizes sales by product type: Year Ended December 31, 2015 2014 2013 (in thousands) Core $ 11,444 $ 29,862 $ 23,294 Wafer 6,627 8,077 12,239 Optical 5,086 7,057 4,523 Research & Development 661 689 1,457 Revenue $ 23,818 $ 45,685 $ 41,513 The following table summarizes assets by geographic region: As of December 31, 2015 2014 (in thousands) United States $ 88,916 $ 156,105 Malaysia 30,276 38,765 Other 50 36 Total Assets $ 119,242 $ 194,906

Investments

Investments	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investments	3. INVESTMENTS The Company invests available cash primarily in FDIC guaranteed certificates of deposits and corporate notes. The Company’s short-term investments balance of $8.9 million as of December 31, 2015 is comprised of corporate notes and bonds of $7.0 million and FDIC guaranteed certificates of deposit of $1.9 million. The Company’s investments are classified as available-for-sale securities and are carried at fair market value with unrealized gains and losses recorded in accumulated other comprehensive income (loss). The following table presents the amortized cost, and gross unrealized gains and losses on all securities at December 31, 2015: Amortized Gross Gross Fair (in thousands) Short-term Investments: FDIC Guaranteed certificates of deposit $ 1,920 $ — $ — $ 1,920 Corporate Notes/Bonds 6,980 — 5 6,975 Total short-term investments $ 8,900 $ — $ 5 $ 8,895 The following table presents the amortized cost, and gross unrealized gains and losses on all securities at December 31, 2014: Amortized Gross Gross Fair (in thousands) Short-term Investments: FDIC Guaranteed certificates of deposit $ 2,120 $ — $ 2 $ 2,118 Corporate Notes/Bonds 18,458 — 14 18,444 Total short-term investments $ 20,578 $ — $ 16 $ 20,562 The Company values its investments at fair value, defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The standard describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value which are the following: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. The Company’s fixed income available-for-sale securities consist of high-quality, investment grade commercial paper, FDIC guaranteed certificates of deposits, corporate notes and government securities. The Company values these securities based on pricing from pricing vendors, who may use quoted prices in active markets for identical assets (Level 1 inputs) or inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs) in determining fair value. The valuation techniques used to measure the fair value of the Company’s financial instruments having Level 2 inputs were derived from non-binding market consensus prices that are corroborated by observable market data, quoted market prices for similar instruments, or pricing models, such as discounted cash flow techniques. The following table summarizes the Company’s financial assets measured at fair value on a recurring basis as of December 31, 2015: Level 1 Level 2 Level 3 Total Cash Equivalents: Money market funds $ 17,702 $ — $ — $ 17,702 Investments: Available-for-sales securities—current: FDIC Guaranteed certificates of deposit — 1,920 — 1,920 Corporate notes/bonds — 6,975 — 6,975 Total $ 17,702 $ 8,895 $ — $ 26,597 The following table summarizes the Company’s financial assets measured at fair value on a recurring basis as of December 31, 2014: Level 1 Level 2 Level 3 Total Cash Equivalents: Money market funds $ 21,963 $ — $ — $ 21,963 Investments: Available-for-sales securities—current: FDIC Guaranteed certificates of deposit — 2,118 — 2,118 Corporate notes/bonds — 18,444 — 18,444 Total $ 21,963 $ 20,562 $ — $ 42,525 There are no terms or conditions restricting the Company from redeeming any of its investments. In addition to the debt securities noted above, the Company had approximately $3.5 million and $2.4 million of time deposits included in cash and cash equivalents as of December 31, 2015 and 2014, respectively.

Significant Customers

Significant Customers	12 Months Ended
	Dec. 31, 2015
Text Block [Abstract]
Significant Customers	4. SIGNIFICANT CUSTOMERS For the year ended December 31, 2015, the Company had two customers that accounted for approximately 16% and 15% of its revenue. For the year ended December 31, 2014, the Company had two customers that accounted for approximately 24% and 12% of its revenue. For the year ended December 31, 2013, the Company had two customers that accounted for approximately 27% and 17% of its revenue. Customers individually representing more than 10% of trade receivables accounted for approximately 48% and 50% of accounts receivable as of December 31, 2015 and 2014, respectively. The Company grants credit to customers based on an evaluation of their financial condition. Losses from credit sales are provided for in the financial statements.

Asset Impairment Charges

Asset Impairment Charges	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Asset Impairment Charges	5. ASSET IMPAIRMENT CHARGES When circumstances, such as adverse market conditions, indicate that the carrying value of a long-lived asset may be impaired, the Company performs an analysis to review the recoverability of the asset’s carrying value. The Company makes estimates of the undiscounted cash flows (excluding interest charges) from the expected future operations of the asset. These estimates consider factors such as expected future operating income, operating trends and prospects, as well as the effects of demand, competition and other factors. If the analysis indicates that the carrying value is not recoverable from future cash flows, an impairment loss is recognized to the extent that the carrying value exceeds the estimated fair value. Any impairment losses are recorded as operating expenses, which reduce net income. In response to the Company’s current period operating losses combined with its history of continuing operating losses, the Company evaluated the recoverability of certain property and equipment. In the third quarter of 2015, the overall outlook for the sapphire market continued to be depressed as industry analysts reported significant worldwide over capacity and pricing of sapphire products reached historical lows. Based upon the Company’s quarterly assessment using its most recent projections, impairment to these assets was indicated as of September 30, 2015, as the recoverable amount of undiscounted cash flows did not exceed the carrying amount of these assets. The Company recorded an asset impairment charge on machinery, equipment and facilities of $39.6 million. The Company evaluated its long-lived assets and has written down the assets using a cost and market approach to determine the current fair market value. In using the fair market value approach, valuation inputs used to measure the fair value follow a hierarchy based on three levels of inputs. Level 1, being the most observable, relies upon quoted prices in active markets for identical assets, Level 2 which includes other inputs that are observable or can be corroborated by observable market data and Level 3, the least observable, that is supported by little or no market activity and are significant to the fair value of the assets. Based on the fair market value approach used by the Company to measure its long-lived assets, the Company determined the assets to be measured at fair value using Level 3 inputs. At December 31, 2015, the Company reviewed the current fair market value and concluded no additional adjustments were needed. The Company will continue to reassess its long-lived assets to ensure the carrying amount of these assets is still appropriate given any changes in the marketplace and other factors used in determining the current fair market value.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Stockholders' Equity	6. STOCKHOLDERS’ EQUITY Common Stock As of December 31, 2015 the Company had reserved 3,305,589 shares of common stock for issuance upon the exercise of outstanding common stock options and vesting of restricted stock units. Also, 732,270 shares of the Company’s common stock were reserved for future grants of stock options and restricted stock units (or other similar equity instruments) under the Company’s 2007 Stock Incentive Plan (the “2007 Plan”) as of December 31, 2015. In addition, 24,380 shares of the Company’s common stock were reserved for future exercise of outstanding warrants as of December 31, 2015. On January 13, 2014, the Company completed a public offering of common stock in which a total of 3,047,500 shares were sold, including 397,500 shares pursuant to the full exercise of the underwriter’s over-allotment option, at a price of $10.65 per share. The Company raised a total of $32.5 million in gross proceeds from the offering, or approximately $30.3 million in net proceeds after deducting the underwriting discount and expenses of $2.3 million. On March 20, 2014, certain stockholders of the Company completed a public offering of 2,875,000 shares of common stock and the Company sold 375,000 shares pursuant to the full exercise of the underwriter’s over-allotment option each at a price of $13.00 per share. The Company raised a total of $4.9 million in gross proceeds from the offering, or approximately $4.4 million in net proceeds after deducting the underwriting discount and expenses of $319,000 and estimated costs of $148,000. Warrants At December 31, 2015 and 2014, the Company had outstanding 24,380 and 267,826 warrants, respectively, to purchase shares of common stock at an exercise price of $3.65 per share. The warrants were issued in conjunction with the issuance of convertible promissory notes issued by the Company to investors from August 2005 through October 2005. The warrants are immediately exercisable and expire 10 years from the date of issuance. For the year ended December 31, 2015, 243,336 warrants expired. Treasury Stock The treasury shares are accounted for using the cost method whereby the entire cost of the acquired stock is recorded as treasury stock. The Company did not repurchase any shares for the twelve months ended December 31, 2015 and 2014.

Stock Incentive Plans

Stock Incentive Plans	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plans	7. STOCK INCENTIVE PLANS The Company sponsored a stock option plan, the 2001 Equity Plan (the “2001 Plan”), which allowed for the granting of incentive and nonqualified stock options for the purchase of common stock. The maximum number of shares which could be awarded or sold under the 2001 Plan was 1,449,667 shares. Each option entitles the holder to purchase one share of common stock at the specified option exercise price. The exercise price of each incentive stock option granted must not be less than the fair market value on the grant date. At the discretion of management and with the approval of the Board of Directors, the Company granted options under the 2001 Plan. Management and the Board of Directors determined vesting periods and expiration dates at the time of the grant. On August 2, 2011, the plan expired. In August 2007, the Company adopted the 2007 Plan, which allows for the grant of incentive stock options, non-statutory stock options, stock appreciation rights, restricted stock, restricted stock units, performance awards and bonus shares. On June 22, 2011, the stockholders of the Company approved an amendment to the 2007 Plan to increase the maximum number of shares that may be awarded or sold under the 2007 Plan by 2,100,000 from 2,307,692 to 4,407,692 shares. The Board of Directors has appointed a committee to administer the plan. The plan committee determines the type of award to be granted, the fair market value, the number of shares covered by the award, and the time when the award vests and may be exercised. The following table summarizes the activity of the stock incentive and equity plans: Shares Number of Weighted- Number of Number of Outstanding at January 1, 2013 2,200,604 2,117,110 $ 13.32 59,932 — Granted (216,913 ) 97,265 8.43 73,707 45,941 Exercised — (27,930 ) 5.02 — — Canceled/forfeited 256,412 (260,375 ) 18.31 — — Outstanding at December 31, 2013 2,240,103 1,926,070 12.46 133,639 45,941 Granted (706,056 ) 574,950 5.04 27,925 103,181 Exercised — (47,654 ) 5.37 — (10,525 ) Canceled/forfeited 238,482 (215,080 ) 16.72 (20,911 ) (3,866 ) Outstanding at December 31, 2014 1,772,529 2,238,286 10.31 140,653 134,731 Granted (1,457,826 ) 992,684 1.40 60,802 404,340 Exercised/issued — (5,692 ) 0.78 — (29,432 ) Canceled/forfeited 417,567 (373,710 ) 10.02 — (55,618 ) Outstanding at December 31, 2015 732,270 2,851,568 $ 7.07 201,455 454,021 The following table sets forth option grants made during 2015, 2014 and 2013 with intrinsic value calculated based on grant date fair value. Date of Grant Number of Exercise Intrinsic January – July 2013 82,815 $6.60 - $7.97 — October 2013 14,450 $12.11 — January – July 2014 39,300 $7.69 - $11.29 — September 2014 300,000 $4.30 - $5.20 — October – December 2014 235,650 $4.25 - $4.41 — March – July 2015 92,600 $2.43 - $4.04 — September – December 2015 900,084 $1.00 - $1.35 — There is no intrinsic value because the exercise price per share of each option was equal to the fair value of the common stock on the date of grant. At December 31, 2015, the exercise prices of outstanding options were as follows: Exercise Price Number of Average Number of $0.78 - $4.94 1,617,436 7.83 488,681 $5.12 - $9.95 554,684 5.29 439,526 $10.02 - $14.00 238,542 3.95 230,494 $15.00 - $18.80 29,776 2.98 29,776 $19.21 - $22.92 356,475 4.03 356,475 $24.95 - $32.67 54,655 4.51 54,655 2,851,568 6.42 1,599,607 The weighted average fair value of the options that became vested in the years ended 2015, 2014 and 2013 was $1.3 million, $2.9 million and $4.8 million, respectively. The following table summarizes the activity of non-vested options: Non-vested Weighted- Non-vested at January 1, 2013 821,002 $ 15.24 Granted 97,265 8.43 Vested (380,413 ) 12.50 Cancelled (211,288 ) 18.55 Non-vested at December 31, 2013 326,566 13.57 Granted 574,950 5.04 Vested (169,361 ) 14.84 Cancelled (103,422 ) 12.74 Non-vested at December 31, 2014 628,733 5.93 Granted 992,684 1.40 Vested (200,402 ) 6.64 Cancelled (169,054 ) 5.86 Non-vested at December 31, 2015 1,251,961 $ 2.23 The Company’s aggregate intrinsic value is calculated as the difference between the exercise price of the underlying stock options and the fair value of the Company’s common stock. Based on the fair market value of the common stock at December 31, 2015 and 2014, there was no aggregate intrinsic value for options outstanding and exercisable. For the years ended December 31, 2015, 2014 and 2013, the Company used historical stock prices as the basis for its volatility assumptions. The assumed risk-free rates were based on U.S. Treasury rates in effect at the time of grant with a term consistent with the expected option lives. The expected term for the year ended December 31, 2015 is based upon the Company’s median average life of its options and in the years ended December 31, 2014 and 2013, is based upon the vesting term of the Company’s options, a review of a peer group of companies, and expected exercise behavior. The forfeiture rate is based on past history of forfeited options. The expense is being allocated using the straight-line method. For the years ended December 31, 2015, 2014 and 2013, the Company recorded $731,000, $840,000 and $1.2 million, respectively, of stock option compensation expense. As of December 31, 2015, the Company has $1.4 million of total unrecognized compensation cost related to non-vested options granted under the Company’s stock-based plans that it expects to recognize over a weighted-average period of 2.84 years. For the years ended December 31, 2015, 2014 and 2013, the assumptions used for the estimated fair value at the date of option grant using the Black-Scholes option-pricing model were as follows: 2015 2014 2013 Weighted average fair value per share of option $1.40 $5.04 $8.49 Expected term 5.5 years 5.3 years 5.3 years Risk free interest rate 1.41% -1.70% 1.66% -1.83% 0.76% -1.42% Volatility 65% 77% 77% Dividend yield None None None Forfeiture rate 18.56% 25.56% 19.18% The Company continues to account for options issued prior to January 1, 2006 under the intrinsic value method. A summary of the Company’s restricted stock units (“RSUs”) is as follows: RSUs Weighted average price at Aggregate intrinsic Non-vested restricted stock units as of January 1, 2013 — $ — Granted 45,941 8.60 Non-vested restricted stock units as of December 31, 2013 45,941 8.60 Granted 103,181 4.43 Vested (10,525 ) 8.60 Cancelled (3,866 ) 8.60 Non-vested restricted stock units as of December 31, 2014 134,731 5.41 Granted 404,340 1.48 Vested (29,432 ) 5.44 Cancelled (55,618 ) 5.37 Non-vested at December 31, 2015 454,021 $ 1.92 $ 517,584 The fair value of each RSU is the market price on the date of grant and is being recorded as compensation expense ratably over the vesting terms. For the years ended December 31, 2015, 2014 and 2013, the Company recorded $224,000, $120,000 and $25,000 of RSU expense, respectively. The RSUs are forfeited by a participant upon termination for any reason and there is no proportionate or partial vesting in the periods between the vesting dates. As of December 31, 2015, there was $661,000 of unrecognized compensation cost related to the non-vested restricted stock units. This cost is expected to be recognized over a weighted-average period of 2.24 years. An analysis of restricted stock issued is as follows: Non-vested restricted stock as of January 1, 2013 4,336 Granted 73,707 Vested (24,329 ) Non-vested restricted stock as of December 31, 2013 53,714 Granted 27,925 Vested (48,521 ) Cancelled (20,911 ) Non-vested restricted stock as of December 31, 2014 12,207 Granted 60,802 Vested (57,809 ) Non-vested restricted stock as of December 31, 2015 15,200 For the years ended December 31, 2015, 2014 and 2013, the Company recorded $295,000, $448,000 and $292,000, respectively, of stock compensation expense related to restricted stock. In 2013, the Board of Directors awarded 47,050 shares of restricted stock and 70,365 stock options to key executives at a price of $7.97, the closing price of the shares on the date of the grant. Vesting of the shares was subject to achievement of specified targets by December 31, 2013 and March 31, 2014. All of the milestones were achieved by the specified dates. As of December 31, 2014, 20,911 restricted shares and 31,274 stock options were cancelled. As of December 31, 2015, the remaining restricted shares were vested.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	8. INCOME TAXES Components of income before income taxes and the income tax provision are as follows: Income (loss) before income taxes Year ended December 31, 2015 2014 2013 (in thousands) U.S. $ (67,254 ) $ (46,562 ) $ (38,114 ) Foreign (10,602 ) 2,647 2,603 Total $ (77,856 ) $ (43,915 ) $ (35,511 ) Income taxes Year ended December 31, 2015 2014 2013 (in thousands) Current U.S. $ — $ — $ — State — — — Foreign 13 6 6 Total current income tax expense 13 6 6 Deferred U.S. — (218 ) (5,863 ) State — (36 ) 691 Foreign (39 ) 326 6 Total deferred income tax expense (benefit) (39 ) 72 (5,166 ) Total income tax expense (benefit) $ (26 ) $ 78 $ (5,160 ) The reconciliation of income tax computed at the federal statutory rate to income before taxes is as follows: Year ended December 31, 2015 2014 2013 U.S. Federal statutory rate (34.0 )% (34.0 )% (34.0 )% State taxes net of federal benefit (4.4 ) (5.7 ) (5.5 ) Foreign rate differential and transactional tax 1.2 (0.5 ) (0.7 ) Impact of foreign tax holiday 3.4 (1.5 ) (1.8 ) Valuation allowance 33.3 41.8 26.9 Other 0.5 0.1 0.6 — % 0.2 % (14.5 )% Deferred income taxes reflect the net tax effects of the temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company’s net deferred income taxes are as follows at December 31: 2015 2014 (in thousands) Deferred tax assets: Allowance for doubtful accounts $ 152 $ 55 Inventory reserves 3,289 918 Accrued liabilities 382 57 Warrant interest expense 269 269 Stock compensation expense 2,478 2,689 State net operating loss—net of tax 7,456 5,923 Net operating loss carryforward 40,417 31,658 Tax credits 671 581 Valuation allowance (52,286 ) (27,151 ) Total deferred tax assets 2,828 14,999 Deferred tax liability: Depreciation (3,320 ) (15,423 ) Prepaid expenses (62 ) (169 ) Net deferred tax liability $ (554 ) $ (593 ) In November 2015, the FASB issued ASU No. 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes In accordance with ASC740 “Accounting for Income Taxes” (“ASC740”), the Company evaluates its deferred income tax assets quarterly to determine if valuation allowances are required or should be adjusted. ASC740 requires that companies assess whether valuation allowances should be established against their deferred tax assets based on consideration of all available evidence, both positive and negative, using a “more likely than not” standard. The Company is in a cumulative loss position for the past three years which is considered significant negative evidence that is difficult to overcome on a “more likely than not” standard through objectively verifiable data. Based on an evaluation in accordance with the accounting standards, as of December 31, 2015 and 2014, a valuation allowance of $52.3 million and $27.2 million, respectively has been recorded against the net U.S. deferred tax assets in order to measure only the portion of the deferred tax assets that are more likely than not to be realized based on the weight of all the available evidence. Until an appropriate level of profitability is attained, the Company expects to maintain a full valuation allowance on its U.S. net deferred tax assets. Any U.S. tax benefits or tax expense recorded on the Company’s Consolidated Statement of Operations will be offset with a corresponding valuation allowance until such time that the Company changes its determination related to the realization of deferred tax assets. In the event that the Company changes its determination as to the amount of deferred tax assets that can be realized, the Company will adjust its valuation allowance with a corresponding impact to the provision for income taxes in the period in which such determination is made. Although the Company is in a full tax valuation allowance position, at December 31, 2014 the Company recorded, as a result of the allocation of income tax between continuing and other comprehensive income, a tax benefit of $254,000 in continuing operations. The net deferred tax liabilities at December 31, 2015 and 2014 are related to tax liabilities that will reverse after the expiration of the Malaysia tax holiday as discussed below. At December 31, 2015, the Company had separate Federal and Illinois net operating loss carryforwards (“NOL”) of $143.5 million and $174.8 million, respectively, which begin to expire in 2021 and 2019, respectively. The Company has not recorded a deferred tax asset for NOL’s, included in the aforementioned amounts, attributable to stock option exercises in the amount of $21.7 million for federal purposes and $26.4 million for state purposes because the Company cannot record these excess tax benefit stock option deductions until the benefit has been realized by actually reducing taxes payable. Last, the Company has recorded an uncertain tax position of $2.6 million that further reduces the net operating loss deferred tax assets reported in the financial statements. In addition, at December 31, 2015, the Company had Federal and Illinois research and development credits and investment tax credits of $525,000, $173,000 and $68,600, respectively which begin to expire in 2017. Tax credits are accounted for using the flow through method and therefore are taken in the year earned. The Company completed an analysis of the utilization of net operating losses subject to limits based upon certain ownership changes as of March 31, 2014. The results of this analysis indicated no ownership change limiting the utilization of net operating losses and tax credits. The Company believes that an updated analysis will not likely indicate an ownership change that would limit the utilization of net operating losses and tax credits at December 31, 2015. The Company prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken, or expected to be taken, in a tax return. At December 31, 2015 and 2014, the Company had unrecognized tax benefits taken or expected to be taken in a tax return that have been recorded on the Company’s financial statements of $1.1 million that are related to tax positions taken in 2012. There were no interest or penalties related to income taxes that have been accrued or recognized as of and for the years ended December 31, 2015, 2014 and 2013. Included in the balance of total unrecognized tax benefits at December 31, 2015, are potential benefits of $1.0 million that if recognized, would affect the effective tax rate in the year recognized. The Company files income tax returns in the United States federal jurisdiction and in a state jurisdiction. During 2009, the Company began foreign operations in Malaysia and Japan and is subject to local income taxes in both jurisdictions. The Company is exempt from Malaysian income tax for a five-year period beginning in 2009 with a five year renewal. The impact of this tax holiday decreased foreign taxes for the years ended December 31, 2015, 2014 and 2013 by approximately $147,000, $335,000, and $651,000, respectively. The benefit of the tax holiday on net income per share (diluted) for the years ended December 31, 2015, 2014 and 2013 was $0.01, $0.01 and $0.03, respectively. The Company’s Malaysia tax returns for the periods ended December 31, 2010 through 2012 have audited by the Malaysia Inland Revenue Board with no changes made to the taxable income for those years. All other tax years in Malaysia are open to examination by tax authorities. The Company’s federal tax returns for the periods ended December 31, 2010, 2008 and 2007 have been audited by the Internal Revenue Service (IRS) with no changes made to the Company’s taxable losses for those years. The Company’s state tax returns for the periods ended December 31, 2009 through 2012 have been audited by the Illinois Department of Revenue with no changes made to the Company’s taxable losses for those years. Due to the existence of net operating loss carryforwards, tax years ended December 31, 2001 through 2006, 2008, 2009 and 2011 through 2014 are open to examination by tax authorities for Federal purposes. Due to net operating loss carryforwards at the State level, tax years ended 2004 through 2006 and 2008 through 2014 are open to examination by state tax authorities. U.S. income and foreign withholding taxes have not been provided on approximately $11.0 million of cumulative undistributed earnings of foreign subsidiaries. We intend to reinvest these earnings for the foreseeable future. If these amounts were distributed to the U.S., in the form of a dividend, at December 31, 2015 there would have been no impact to the provision of income taxes. Due to the U.S. NOL’s and the full valuation allowance recorded any additional income from the dividends would have been offset by the NOL’s and a corresponding adjustment to the valuation allowance. At December 31, 2015, dividends per the Malaysia statute are not subject to withholding. Determination of the amount of unrecognized deferred income tax liabilities that may be due in the future on these earnings is not practicable because such liability, if any, is dependent on circumstances existing, if and when remittance occurs.

Credit Facility

Credit Facility	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Credit Facility	9. CREDIT FACILITY On January 2, 2013, the Company entered into a three-year term agreement with a bank to provide the Company with a senior secured credit facility of up to $25.0 million. The agreement provides for the Company to borrow up to 80% of eligible accounts receivable and up to 35% of domestically held raw material and finished goods inventory. Advances against inventory are limited to 40% of the aggregate outstanding on the revolving line of credit and $10.0 million in aggregate. The Company has the option to borrow at an interest rate of LIBOR plus 2.75% or the Wall Street Journal prime rate plus 0.50%. If the Company maintains liquidity of $20.0 million or greater with the lending institution, then the borrowing interest rate options are LIBOR plus 2.25% or the Wall Street Journal prime rate. There is an unused revolving line facility fee of 0.375% per annum. The facility is secured by a first priority interest in substantially all of the Company’s personal property, excluding intellectual property. The Company is required to maintain an adjusted quick ratio of 1.40 to 1.00, maintain operating and other deposit accounts with the bank or bank’s affiliates of 25% of the Company’s total worldwide cash, securities and investments, and the Company can pay dividends or repurchase capital stock only with the bank’s consent during the three year term. In August 2015, the Company entered into an amendment agreement with the bank to extend the senior secured facility through January 2, 2018. Under the amended agreement, advances against inventory are limited to the lesser of 45% of the aggregate outstanding principal on the revolving line of credit and $10.0 million and the rate on facility fee on the unused portion of the revolving line was adjusted to 0.50% per annum. All other terms and conditions remain the same. As of December 31, 2015 the Company had available borrowing capacity of $2.3 million under this facility. At December 31, 2015, the Company had borrowed $1.5 million against this facility electing a borrowing rate of LIBOR plus 2.25%. The agreement contains a subjective acceleration clause and requires the Company to maintain a lockbox. As a result, the Company has classified the debt as a current liability on its balance sheet. For year ended December 31, 2015 the Company recorded interest expense of $109,000 which includes $107,000 of interest expense charged on the unused portion of the facility. For years ended December 31, 2014 and 2013, the Company did not draw on this facility and the Company recorded $95,000, for each of the two years, of interest expense charged on the unused portion of the facility.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	10. COMMITMENTS AND CONTINGENCIES Operating Leases The Company leases buildings used for manufacturing and offices. The leases provide for payment of the Company’s proportionate share of operating expenses and real estate taxes. Net rent expense under operating leases in 2015, 2014 and 2013 amounted to $653,400, $1.0 million and $1.1 million respectively. Future minimum payments under all leases are as follows: Year ending December 31, Operating 2016 $ 599 2017 592 2018 468 2019 145 Balance at December 31, 2015 $ 1,804 Purchase Commitments The Company has entered into agreements for electricity and to purchase equipment and components to construct furnaces. These agreements will result in the Company purchasing electricity, equipment or components for a total cost of approximately $6.1 million with deliveries occurring through December 2017. Litigation From time to time, the Company experiences routine litigation in the normal course of its business. The management of the Company does not believe any pending litigation will have a material adverse effect, other than as set forth below, on the financial condition or results of operations of the Company. On April 30, 2015, Firerock Global Opportunity Fund LP filed a complaint in the Northern District of Illinois asserting federal securities claims against the Company, certain officers, its directors and the underwriters in the Company’s March 2014 stock offering. The complaint sought as a remedy either money damages or rescission of the March offering, plus attorneys’ fees. On October 29, 2015, after mediation and subsequent discussions, the parties reached a settlement agreement in principle. On January 27, 2016 the United States District Court for the Northern District of Illinois granted a motion for preliminary approval of the agreement. The settlement agreement includes a release of all defendants, and dismissal of the case against all defendants with prejudice. The Company recorded for the twelve months ended December 31, 2015 an expense of $1.1 million of which $900,000 is the amount the Company contributed to the settlement and paid on February 17, 2016. The remaining costs of the settlement are expected to be covered by insurance. On November 19, 2015, the Carolyn Piper Smithhisler Living Trust, derivatively on behalf of Rubicon Technology Inc., filed a complaint in the Eighteenth Judicial District of Illinois against the Company’s Board of Directors and certain senior officers seeking to remedy alleged breaches of fiduciary duties and other violations of the law, failure to implement an effective system of internal controls, and failure to oversee the public statements made by the Company and certain individual defendants. The complaint seeks as a remedy to recover damages against the individual defendants for the benefit of the Company and to require the Company to reform and improve its corporate governance and internal procedures plus attorneys’ fees. The Company intends to vigorously defend this lawsuit. Due to the preliminary nature of the lawsuit, at this time, the Company cannot predict an outcome, nor is it reasonably possible to estimate the amount or range of loss, if any, that would be associated with an adverse decision.

Benefit Plan

Benefit Plan	12 Months Ended
	Dec. 31, 2015
Postemployment Benefits [Abstract]
Benefit Plan	11. BENEFIT PLAN The Company sponsors a 401(k) savings plan (the “Plan”). Employees are eligible to participate in the Plan upon reaching 18 years of age. Employees make contributions to the Plan through payroll deferrals and employer matching contributions are discretionary. There were no employer matching contributions for the years ended December 31, 2015, 2014 and 2013.

Quarterly Financial Data (Unaud

Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data (Unaudited)	12. QUARTERLY FINANCIAL DATA (Unaudited) Quarterly Financial Data (Unaudited) Summary quarterly results for the two years ended December 31, 2015 are as follows (in thousands, other than share and per share data): Three Months Ended Full Year 2015 March 31 June 30 September 30 December 31 Revenue $ 8,910 $ 7,106 $ 5,346 $ 2,456 $ 23,818 Gross loss $ (5,109 ) $ (5,155 ) $ (3,891 ) $ (8,988 ) $ (23,143 ) Loss from operations $ (7,948 ) $ (8,322 ) $ (47,370 ) $ (12,309 ) $ (75,949 ) Loss before income taxes $ (8,312 ) $ (8,529 ) $ (48,859 ) $ (12,156 ) $ (77,856 ) Net loss $ (8,348 ) $ (8,580 ) $ (48,196 ) $ (12,706 ) $ (77,830 ) Basic and diluted loss per common share $ (0.32 ) $ (0.33 ) $ (1.84 ) $ (0.49 ) $ (2.98 ) Weighted average common shares outstanding used in computing net loss per common share, basic and diluted: 26,129,276 26,142,261 26,160,308 26,192,838 26,156,170 Three Months Ended Full Year 2014 March 31 June 30 September 30 December 31 Revenue $ 14,268 $ 14,469 $ 8,036 $ 8,912 $ 45,685 Gross loss $ (7,494 ) $ (7,274 ) $ (9,460 ) $ (5,459 ) $ (29,687 ) Loss from operations $ (10,925 ) $ (10,179 ) $ (13,872 ) $ (8,637 ) $ (43,613 ) Loss before income taxes $ (10,888 ) $ (9,984 ) $ (14,011 ) $ (9,032 ) $ (43,915 ) Net loss $ (10,894 ) $ (9,984 ) $ (13,713 ) $ (9,402 ) $ (43,993 ) Basic and diluted loss per common share $ (0.43 ) $ (0.39 ) $ (0.53 ) $ (0.36 ) $ (1.70 ) Weighted average common shares outstanding used in computing net loss per common share, basic and diluted: 25,317,147 25,706,797 26,110,651 26,127,026 25,815,405

Summary of Significant Accoun20

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Description of business	Description of business Rubicon Technology, Inc., a Delaware corporation (the “Company”), is an electronic materials provider that develops, manufactures and sells monocrystalline sapphire and other innovative crystalline products for LEDs, RFICs, optoelectronics and other optical applications. The Company sells its products on a global basis to customers in Asia, Australia, North America and Europe. The Company maintains its operating facilities in the Chicago metropolitan area and in Penang, Malaysia.
Principles of consolidation	Principles of consolidation The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, Rubicon Worldwide LLC, Rubicon Sapphire Technology (Malaysia) SDN BHD, Rubicon Technology Hong Kong Limited and Rubicon Technology Korea Yuhan Hosea. All intercompany transactions and balances have been eliminated in consolidation. A summary of the Company’s significant accounting policies applied in the preparation of the accompanying consolidated financial statements follows.
Cash and cash equivalents	Cash and cash equivalents The Company considers all unrestricted highly liquid investments immediately available to be cash equivalents. Cash equivalents primarily consist of time deposits with banks, unsettled trades and brokerage money market accounts.
Restricted cash	Restricted cash A summary of the Company’s restricted cash at December 31, 2015 and 2014 is as follows: As of December 31, 2015 2014 (in thousands) Certificates of deposit $ 5 $ 5 Flexible spending funds 2 4 Fixed deposit pledge 163 174 $ 170 $ 183
Foreign currency translation and transactions	Foreign currency translation and transactions Rubicon Worldwide LLC, Rubicon Technology Hong Kong Limited and Rubicon Technology Korea Yuhan Hosea’s assets and liabilities are translated into U.S. dollars at exchange rates existing at the respective balance sheet dates and capital accounts at historical exchange rates. The results of operations are translated into U.S. dollars at the average exchange rates during the respective period. Translation adjustments resulting from fluctuations in exchange rates for Rubicon Worldwide LLC, Rubicon Technology Hong Kong Limited and Rubicon Technology Korea Yuhan Hosea are recorded as a separate component of accumulated other comprehensive income (loss) within stockholders’ equity. The Company has determined that the functional currency of Rubicon Sapphire Technology (Malaysia) SDN BHD is the U.S. dollar. Rubicon Sapphire Technology (Malaysia) SDN BHD’s assets and liabilities are translated into U.S. dollars using the remeasurement method. Non-monetary assets are translated at historical exchange rates and monetary assets are translated at exchange rates existing at the respective balance sheet dates. Translation adjustments for Rubicon Sapphire Technology (Malaysia) SDN BHD are included in determining net income (loss) for the period. The results of operations are translated into U.S. dollars at the average exchange rates during the respective period. The Company records these gains and losses in other income (expense). Foreign currency transaction gains and losses are generated from the effects of exchange rate changes on transactions denominated in a currency other than the functional currency of the Company, which is the U.S. dollar. Gains and losses on foreign currency transactions are generally required to be recognized in the determination of net income (loss) for the period. The Company records these gains and losses in other income (expense).
Investments	Investments The Company invests available cash primarily in investment grade commercial paper, FDIC guaranteed certificates of deposit, common stock, corporate notes and government securities. Investments classified as available-for-sale securities are carried at fair market value with unrealized gains and losses recorded in accumulated other comprehensive income (loss). Investments in trading securities are reported at fair value, with both realized and unrealized gains and losses recorded in other income (expense), in the consolidated statements of operations. Investments in which the Company has the ability and intent, if necessary, to liquidate in order to support its current operations, are classified as short-term. The Company reviews its available-for-sale securities investments at the end of each quarter for other-than-temporary declines in fair value based on the specific identification method. The Company considers various factors in determining whether an impairment is other-than-temporary, including the severity and duration of the impairment, changes in underlying credit ratings, forecasted recovery, its ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery in market value and the probability that the scheduled cash payments will continue to be made. When the Company concludes that an other-than-temporary impairment has resulted, the difference between the fair value and carrying value is written off and recorded as a charge on the consolidated statements of operations. As of December 31, 2015 and 2014, no impairment was recorded.
Treasury Stock	Treasury Stock The Company records treasury stock purchases under the cost method whereby the entire cost of the acquired stock is recorded as treasury stock.
Accounts receivable	Accounts receivable The majority of the Company’s accounts receivable is due from manufacturers serving the light-emitting diodes (“LED”) and optical systems and specialty devices industries. Credit is extended based on an evaluation of the customer’s financial condition. Accounts receivable are due based on contract terms and at stated amounts due from customers, net of an allowance for doubtful accounts. Accounts outstanding longer than the contractual payment terms are considered past due. The Company determines its allowance by considering a number of factors, including the length of time a customer’s account is past due, the customer’s current ability to pay and the condition of the general economy and industry as a whole. The Company writes off accounts receivable when they are deemed uncollectible and such write-offs, net of payments received, are recorded as a reduction to bad debt expense. The following table shows the activity of the allowance for doubtful accounts: Year ended December 31, 2015 2014 (in thousands) Beginning balance $ 140 $ 50 Charges to costs and expenses 235 105 Accounts charged off, less recoveries 14 (15 ) Ending balance $ 389 $ 140
Inventories	Inventories Inventories are valued at the lower of cost or market. Raw materials cost is determined using the first-in, first-out method, and work-in-process and finished goods costs are determined on a weighted-average cost basis which includes materials, labor and overhead. The Company reduces the carrying value of its inventories for differences between the cost and the estimated net realizable value, taking into account usage, expected demand, technological obsolescence and other information. Inventories are composed of the following: As of December 31, 2015 2014 (in thousands) Raw materials $ 7,346 $ 14,503 Work in progress 9,920 6,357 Finished goods 4,067 1,879 $ 21,333 $ 22,739 The Company establishes inventory reserves when conditions exist that suggest inventory may be in excess of anticipated demand or is obsolete based on customer required specifications. The Company evaluates the ability to realize the value of our inventory based on a combination of factors, including forecasted sales, estimated current and future market value and changes in customers’ product specifications. For the years ended December 31, 2015, 2014 and 2013, the Company determined it had inventory that was excess or obsolete and recorded an adjustment which reduced inventory and increased costs of goods sold by $202,000, $2.4 million and $604,000, respectively. The Company has accepted sales orders for core and wafer products at prices lower than cost during 2015, 2014 and 2013. Based on these sales prices, the Company recorded during the years ended December 31, 2015, 2014 and 2013, a lower of cost or market adjustment which reduced inventory and increased cost of goods sold by $3.9 million, $1.7 million and $421,000, respectively. For the three months ended December 31, 2015, a significant sequential decrease in pricing resulted in a lower of cost or market adjustment of $2.8 million that decreased inventory and increased costs of goods sold for the period. This significant pricing decline in the fourth quarter 2015 triggered the Company to review its raw material inventory valuation. Based on the Company’s review of the current outlook of volume and pricing, the Company determined its current cost to produce its own raw material best reflected the replacement cost. As a result of this assessment for the year ended December 31, 2015, the Company recorded an adjustment which reduced its raw material inventory and increased its costs of goods sold by $2.2 million.
Property and equipment	Property and equipment Property and equipment consisted of the following: As of December 31, 2015 2014 (in thousands) Land and land improvements $ 4,133 $ 4,133 Buildings 26,097 32,482 Machinery, equipment and tooling 50,364 127,158 Leasehold improvements 7,141 7,640 Furniture and fixtures 816 961 Information systems 1,105 1,140 Construction in progress 1,327 3,734 Total cost 90,983 177,248 Accumulated depreciation and amortization (33,414 ) (69,572 ) Property and equipment, net $ 57,569 $ 107,676 Property and equipment are carried at cost and depreciated over their estimated useful lives using the straight-line method. The cost of maintenance and repairs is charged to expense as incurred. Significant renewals and improvements are capitalized. Depreciation and amortization expense associated with property and equipment was $11.4 million, $13.6 million and $12.7 million for the years ended December 31, 2015, 2014 and 2013, respectively. Construction in progress includes costs associated with the construction of furnaces and deposits made on equipment purchases. The estimated useful lives are as follows: Asset description Life Buildings 39 years Machinery, equipment and tooling 3-10 years Leasehold improvements Lesser of life of lease or economic life Furniture and fixtures 7 years Information systems 3 years
Other assets	Other assets The Company’s other assets include overhaul costs that are accounted for using the deferral method. These overhaul costs are recorded at cost on the balance sheet as other assets and are amortized over terms in accordance with their respectful useful lives.
Warranty cost	Warranty cost The Company’s sales terms include a warranty that its products will meet certain specifications. The Company records a current liability for the expected cost of warranty-related claims at the time of sale. The warranty reserve is included in accrued and other current liabilities on the consolidated balance sheets. The following table presents changes in the Company’s product warranty liability: Year ended 2015 2014 (in thousands) Balance, beginning of period $ 97 $ 141 Charged to cost of sales 90 407 Actual product warranty expenditures (114 ) (451 ) Balance, end of period $ 73 $ 97
Fair value of financial instruments	Fair value of financial instruments The Company’s financial instruments consist primarily of cash and cash equivalents, short-term investments, accounts receivable, and accounts payable. The carrying values of these assets and liabilities approximate their fair values due to the short-term nature of these instruments at December 31, 2015 and 2014.
Concentration of credit risks and other risks and uncertainties	Concentration of credit risks and other risks and uncertainties Financial instruments that could potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. At December 31, 2015 and 2014, the Company had $2.9 million and $1.5 million, respectively, on deposit at financial institutions in excess of amounts insured by the Federal Deposit Insurance Corporation and other foreign governmental insurance agencies. The Company performs a periodic evaluation of these institutions for relative credit standing. The Company has not experienced any losses in such accounts and management believes it is not exposed to any significant risk of loss on these balances. The Company currently depends on a small number of suppliers for certain raw materials, components, services and equipment, including key materials such as aluminum oxide powder and certain furnace components. If the supply of these components were to be disrupted or terminated, or if these suppliers were unable to supply the quantities of raw materials required, the Company may have difficulty in finding, or may be unable to find, alternative sources for these items. As a result, the Company may be unable to meet the demand for its products, which could have a material adverse impact on the Company. Concentration of credit risk related to revenue and accounts receivable is discussed in Note 4.
Revenue recognition	Revenue recognition Revenues recognized include product sales and billings for costs and fees for government contracts. Product Sales The Company recognizes revenue from product sales when earned. Revenue is recognized when, and if, evidence of an arrangement is obtained and the other criteria to support revenue recognition are met, including: • Persuasive evidence of an arrangement exists • Title has passed and the product has been delivered. • The price is fixed or determinable • Collection of the resulting receivable is reasonably assured. Government Contracts The Company recognizes research and development revenue in the period during which the related costs are incurred over the contractually defined period. In July 2012, the Company signed a contract with the Air Force Research Laboratory to produce large-area sapphire windows on a cost plus fixed fee basis. The Company records revenue on a gross basis as costs are incurred plus a portion of the fixed fee. For the years ended December 31, 2015, 2014, and 2013, $661,000, $689,000 and $1.4 million, respectively of revenue were recorded. To date, the Company has recorded $4.0 million in revenue and the total value of the contract is $4.7 million. The Company does not provide maintenance or other services and it does not have sales that involve multiple elements or deliverables.
Shipping and handling costs	Shipping and handling costs The Company records costs incurred in connection with shipping and handling of products as cost of goods sold. Amounts billed to customers in connection with these costs are included in revenue and are not material for any of the periods presented in the accompanying financial statements.
Sales tax	Sales tax The Company collects and remits sales taxes on products sold to customers and reports such amounts under the net method in its consolidated statements of operations and records a liability until remitted to the respective tax authority.
Stock-based compensation	Stock-based compensation The Company requires all share-based payments to employees, including grants of employee stock options to be measured at fair value and expensed in the consolidated statements of operations over the service period (generally the vesting period) of the grant. Expense is recognized in the consolidated statements of operations for these share-based payments.
Research and development	Research and development Research and development costs are expensed as incurred. Research and development expense was $2.2 million, $1.9 million and $2.3 million for the years ended December 31, 2015, 2014 and 2013, respectively.
Accounting for uncertainty in income taxes	Accounting for uncertainty in income taxes The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the financial statements from such positions are then measured based on the largest benefit that has a greater than 50% likelihood of being realized upon settlement. The Company recognizes interest and/or penalties related to income tax matters in income tax expense. There were no interest or penalties related to income taxes that have been accrued or recognized as of and for the years ended December 31, 2015 and 2014. The Company is subject to taxation in the U.S., Japan and in a state jurisdiction. The Company is exempt from Malaysian income tax for a five year period beginning in 2009 with a five year renewal. Due to the existence of net operating loss carryforwards, tax years ended December 31, 2001 through 2006, 2008, 2009 and 2011 through 2014 are open to examination by tax authorities for Federal purposes. Due to net operating loss carryforwards at the State level, tax years ended 2004 through 2006 and 2008 through 2014 are open to examination by state tax authorities. Tax years 2013 and 2014 are open to examination by tax authorities in Malaysia.
Income taxes	Income taxes Deferred tax assets and liabilities are provided for temporary differences between financial reporting and income tax bases of assets and liabilities, and are measured using the enacted tax rates and laws expected to be in effect when the differences will reverse. Deferred income taxes also arise from the future benefits of net operating loss carryforwards. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts expected to be realized. Full valuation allowances on net deferred tax assets are maintained until an appropriate level of profitability that generates taxable income is deemed sustainable or until a tax strategy is developed that would enable the Company to conclude that it is more likely than not that a portion of the deferred tax assets will be realizable. Based on an evaluation in accordance with the accounting standards, as of December 31, 2015 and 2014, a valuation allowance has been recorded against the net U.S. deferred tax assets in order to measure only the portion of the deferred tax assets that are more likely than not to be realized based on the weight of all the available evidence.
Use of estimates	Use of estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Other comprehensive loss	Other comprehensive loss Comprehensive loss is defined as the change in equity of a business enterprise from transactions and other events from non-owner sources. Comprehensive loss includes net loss and other non-owner changes in equity that bypass the statement of operations and are reported in a separate component of equity. A summary of the components of comprehensive loss for the years ended December 31, 2015 and 2014 follows: Year Ended December 31, 2015 2014 (in thousands) Reclassification of unrealized gain included in net loss $ — $ 388 Unrealized loss on investments, net of tax (17 ) (415 ) Unrealized loss on currency translation (16 ) (16 ) Ending Balance $ (33 ) $ (43 )
Net income (loss) per common share	Net income (loss) per common share Basic net income (loss) per share is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is computed by dividing net income (loss) by the weighted average number of diluted common shares outstanding during the period. Diluted shares outstanding are calculated by adding to the weighted shares outstanding any common stock equivalents, outstanding stock options and warrants based on the treasury stock method. Diluted net loss per common share is the same as basic net loss per common share for the years ended December 31, 2015 and 2014, because the effects of potentially dilutive securities are anti-dilutive. As of December 31, 2015, diluted shares outstanding were the same as basic shares outstanding. The number of anti-dilutive shares excluded from the calculation of diluted net loss per share is as follows as of December 31, 2014: 2014 Warrants 46,290 Stock options 4,146 50,436
Recent accounting pronouncements	Recent accounting pronouncements In May 2014, the FASB issued ASU No. 2014-09 (“ASU 2014-09”), Revenue from Contracts with Customers In June 2014, the FASB issued ASU No. 2014-12 (“ASU 2014-12”), Compensation – Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period In August 2014, the FASB issued ASU 2014-15 (“ASU 2014-15”), Presentation of Financial Statements—Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern In April 2015, the FASB issued ASU 2015-03 (“ASU 2015-03”), Simplifying the Presentation of Debt Issuance Costs . Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements In July 2015, the FASB issued ASU No. 2015-11 (“ASU 2015-11”), Inventory (Topic 330): Simplifying the Measurement of Inventory. In November 2015, the FASB issued ASU 2015-17, Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes In January 2016, the FASB issued ASU 2016-01 (“ASU 2016-01”), Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost. These changes become effective for fiscal years beginning after December 15, 2017. The Company is evaluating the impact, if any, of adopting ASU 2016-01 on its financial statements.

Summary of Significant Accoun21

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Company's Restricted Cash	A summary of the Company’s restricted cash at December 31, 2015 and 2014 is as follows: As of December 31, 2015 2014 (in thousands) Certificates of deposit $ 5 $ 5 Flexible spending funds 2 4 Fixed deposit pledge 163 174 $ 170 $ 183
Activity of Allowance for Doubtful Accounts	The following table shows the activity of the allowance for doubtful accounts: Year ended December 31, 2015 2014 (in thousands) Beginning balance $ 140 $ 50 Charges to costs and expenses 235 105 Accounts charged off, less recoveries 14 (15 ) Ending balance $ 389 $ 140
Inventories	Inventories are composed of the following: As of December 31, 2015 2014 (in thousands) Raw materials $ 7,346 $ 14,503 Work in progress 9,920 6,357 Finished goods 4,067 1,879 $ 21,333 $ 22,739
Property and Equipment	Property and equipment consisted of the following: As of December 31, 2015 2014 (in thousands) Land and land improvements $ 4,133 $ 4,133 Buildings 26,097 32,482 Machinery, equipment and tooling 50,364 127,158 Leasehold improvements 7,141 7,640 Furniture and fixtures 816 961 Information systems 1,105 1,140 Construction in progress 1,327 3,734 Total cost 90,983 177,248 Accumulated depreciation and amortization (33,414 ) (69,572 ) Property and equipment, net $ 57,569 $ 107,676
Property and Equipment, Estimated Useful Lives	The estimated useful lives are as follows: Asset description Life Buildings 39 years Machinery, equipment and tooling 3-10 years Leasehold improvements Lesser of life of lease or economic life Furniture and fixtures 7 years Information systems 3 years
Product Warranty Liability	The following table presents changes in the Company’s product warranty liability: Year ended 2015 2014 (in thousands) Balance, beginning of period $ 97 $ 141 Charged to cost of sales 90 407 Actual product warranty expenditures (114 ) (451 ) Balance, end of period $ 73 $ 97
Components of Comprehensive Loss	A summary of the components of comprehensive loss for the years ended December 31, 2015 and 2014 follows: Year Ended December 31, 2015 2014 (in thousands) Reclassification of unrealized gain included in net loss $ — $ 388 Unrealized loss on investments, net of tax (17 ) (415 ) Unrealized loss on currency translation (16 ) (16 ) Ending Balance $ (33 ) $ (43 )
Anti-Dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share	The number of anti-dilutive shares excluded from the calculation of diluted net loss per share is as follows as of December 31, 2014: 2014 Warrants 46,290 Stock options 4,146 50,436

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Summary of Revenue by Geographic Region	The following table summarizes revenue by geographic region: Year Ended December 31, 2015 2014 2013 (in thousands) China $ 5,499 $ 19,857 $ 14,844 United States 4,894 5,452 4,444 Germany 3,718 925 436 Korea 3,646 5,001 2,214 Taiwan 3,490 9,843 7,361 Australia 913 716 10,368 Israel 785 1,169 455 Canada 522 976 337 Japan 342 1,517 309 Other 9 229 745 Revenue $ 23,818 $ 45,685 $ 41,513
Summary of Sales by Product Type	The following table summarizes sales by product type: Year Ended December 31, 2015 2014 2013 (in thousands) Core $ 11,444 $ 29,862 $ 23,294 Wafer 6,627 8,077 12,239 Optical 5,086 7,057 4,523 Research & Development 661 689 1,457 Revenue $ 23,818 $ 45,685 $ 41,513
Summary of Assets by Geographic Region	The following table summarizes assets by geographic region: As of December 31, 2015 2014 (in thousands) United States $ 88,916 $ 156,105 Malaysia 30,276 38,765 Other 50 36 Total Assets $ 119,242 $ 194,906

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Amortized Cost and Gross Unrealized Gains and Losses on All Securities	The following table presents the amortized cost, and gross unrealized gains and losses on all securities at December 31, 2015: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value (in thousands) Short-term Investments: FDIC Guaranteed certificates of deposit $ 1,920 $ — $ — $ 1,920 Corporate Notes/Bonds 6,980 — 5 6,975 Total short-term investments $ 8,900 $ — $ 5 $ 8,895 The following table presents the amortized cost, and gross unrealized gains and losses on all securities at December 31, 2014: Amortized Gross Gross Fair (in thousands) Short-term Investments: FDIC Guaranteed certificates of deposit $ 2,120 $ — $ 2 $ 2,118 Corporate Notes/Bonds 18,458 — 14 18,444 Total short-term investments $ 20,578 $ — $ 16 $ 20,562
Summarized Financial Assets Measured at Fair Value on Recurring Basis	The following table summarizes the Company’s financial assets measured at fair value on a recurring basis as of December 31, 2015: Level 1 Level 2 Level 3 Total Cash Equivalents: Money market funds $ 17,702 $ — $ — $ 17,702 Investments: Available-for-sales securities—current: FDIC Guaranteed certificates of deposit — 1,920 — 1,920 Corporate notes/bonds — 6,975 — 6,975 Total $ 17,702 $ 8,895 $ — $ 26,597 The following table summarizes the Company’s financial assets measured at fair value on a recurring basis as of December 31, 2014: Level 1 Level 2 Level 3 Total Cash Equivalents: Money market funds $ 21,963 $ — $ — $ 21,963 Investments: Available-for-sales securities—current: FDIC Guaranteed certificates of deposit — 2,118 — 2,118 Corporate notes/bonds — 18,444 — 18,444 Total $ 21,963 $ 20,562 $ — $ 42,525

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Summary of Activity of Stock Incentive and Equity Plans	The following table summarizes the activity of the stock incentive and equity plans: Shares Number of Weighted- Number of Number of Outstanding at January 1, 2013 2,200,604 2,117,110 $ 13.32 59,932 — Granted (216,913 ) 97,265 8.43 73,707 45,941 Exercised — (27,930 ) 5.02 — — Canceled/forfeited 256,412 (260,375 ) 18.31 — — Outstanding at December 31, 2013 2,240,103 1,926,070 12.46 133,639 45,941 Granted (706,056 ) 574,950 5.04 27,925 103,181 Exercised — (47,654 ) 5.37 — (10,525 ) Canceled/forfeited 238,482 (215,080 ) 16.72 (20,911 ) (3,866 ) Outstanding at December 31, 2014 1,772,529 2,238,286 10.31 140,653 134,731 Granted (1,457,826 ) 992,684 1.40 60,802 404,340 Exercised/issued — (5,692 ) 0.78 — (29,432 ) Canceled/forfeited 417,567 (373,710 ) 10.02 — (55,618 ) Outstanding at December 31, 2015 732,270 2,851,568 $ 7.07 201,455 454,021
Intrinsic Value Calculated Based on Grant Date Fair Value	The following table sets forth option grants made during 2015, 2014 and 2013 with intrinsic value calculated based on grant date fair value. Date of Grant Number of Exercise Intrinsic January – July 2013 82,815 $6.60 - $7.97 — October 2013 14,450 $12.11 — January – July 2014 39,300 $7.69 - $11.29 — September 2014 300,000 $4.30 - $5.20 — October – December 2014 235,650 $4.25 - $4.41 — March – July 2015 92,600 $2.43 - $4.04 — September – December 2015 900,084 $1.00 - $1.35 —
Exercise Prices of Outstanding Options	At December 31, 2015, the exercise prices of outstanding options were as follows: Exercise Price Number of Average Number of $0.78 - $4.94 1,617,436 7.83 488,681 $5.12 - $9.95 554,684 5.29 439,526 $10.02 - $14.00 238,542 3.95 230,494 $15.00 - $18.80 29,776 2.98 29,776 $19.21 - $22.92 356,475 4.03 356,475 $24.95 - $32.67 54,655 4.51 54,655 2,851,568 6.42 1,599,607
Summary of Non-vested Options	The following table summarizes the activity of non-vested options: Non-vested Weighted- Non-vested at January 1, 2013 821,002 $ 15.24 Granted 97,265 8.43 Vested (380,413 ) 12.50 Cancelled (211,288 ) 18.55 Non-vested at December 31, 2013 326,566 13.57 Granted 574,950 5.04 Vested (169,361 ) 14.84 Cancelled (103,422 ) 12.74 Non-vested at December 31, 2014 628,733 5.93 Granted 992,684 1.40 Vested (200,402 ) 6.64 Cancelled (169,054 ) 5.86 Non-vested at December 31, 2015 1,251,961 $ 2.23
Schedule for Estimated Fair Value at Date of Option Grant Using Black Scholes Option Pricing Model	For the years ended December 31, 2015, 2014 and 2013, the assumptions used for the estimated fair value at the date of option grant using the Black-Scholes option-pricing model were as follows: 2015 2014 2013 Weighted average fair value per share of option $1.40 $5.04 $8.49 Expected term 5.5 years 5.3 years 5.3 years Risk free interest rate 1.41% -1.70% 1.66% -1.83% 0.76% -1.42% Volatility 65% 77% 77% Dividend yield None None None Forfeiture rate 18.56% 25.56% 19.18%
Restricted Stock Units [Member]
Analysis of Restricted Stock Units Issued	A summary of the Company’s restricted stock units (“RSUs”) is as follows: RSUs Weighted average price at Aggregate intrinsic Non-vested restricted stock units as of January 1, 2013 — $ — Granted 45,941 8.60 Non-vested restricted stock units as of December 31, 2013 45,941 8.60 Granted 103,181 4.43 Vested (10,525 ) 8.60 Cancelled (3,866 ) 8.60 Non-vested restricted stock units as of December 31, 2014 134,731 5.41 Granted 404,340 1.48 Vested (29,432 ) 5.44 Cancelled (55,618 ) 5.37 Non-vested at December 31, 2015 454,021 $ 1.92 $ 517,584
Restricted Stock [Member]
Analysis of Restricted Stock Units Issued	An analysis of restricted stock issued is as follows: Non-vested restricted stock as of January 1, 2013 4,336 Granted 73,707 Vested (24,329 ) Non-vested restricted stock as of December 31, 2013 53,714 Granted 27,925 Vested (48,521 ) Cancelled (20,911 ) Non-vested restricted stock as of December 31, 2014 12,207 Granted 60,802 Vested (57,809 ) Non-vested restricted stock as of December 31, 2015 15,200

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income (Loss) Before Income Taxes	Income (loss) before income taxes Year ended December 31, 2015 2014 2013 (in thousands) U.S. $ (67,254 ) $ (46,562 ) $ (38,114 ) Foreign (10,602 ) 2,647 2,603 Total $ (77,856 ) $ (43,915 ) $ (35,511 )
Income Tax Expense (Benefit)	Income taxes Year ended December 31, 2015 2014 2013 (in thousands) Current U.S. $ — $ — $ — State — — — Foreign 13 6 6 Total current income tax expense 13 6 6 Deferred U.S. — (218 ) (5,863 ) State — (36 ) 691 Foreign (39 ) 326 6 Total deferred income tax expense (benefit) (39 ) 72 (5,166 ) Total income tax expense (benefit) $ (26 ) $ 78 $ (5,160 )
Reconciliation of Income Tax Computed at Federal Statutory Rate to Income Before Taxes	The reconciliation of income tax computed at the federal statutory rate to income before taxes is as follows: Year ended December 31, 2015 2014 2013 U.S. Federal statutory rate (34.0 )% (34.0 )% (34.0 )% State taxes net of federal benefit (4.4 ) (5.7 ) (5.5 ) Foreign rate differential and transactional tax 1.2 (0.5 ) (0.7 ) Impact of foreign tax holiday 3.4 (1.5 ) (1.8 ) Valuation allowance 33.3 41.8 26.9 Other 0.5 0.1 0.6 — % 0.2 % (14.5 )%
Significant Components of Net Deferred Income Taxes	Significant components of the Company’s net deferred income taxes are as follows at December 31: 2015 2014 (in thousands) Deferred tax assets: Allowance for doubtful accounts $ 152 $ 55 Inventory reserves 3,289 918 Accrued liabilities 382 57 Warrant interest expense 269 269 Stock compensation expense 2,478 2,689 State net operating loss—net of tax 7,456 5,923 Net operating loss carryforward 40,417 31,658 Tax credits 671 581 Valuation allowance (52,286 ) (27,151 ) Total deferred tax assets 2,828 14,999 Deferred tax liability: Depreciation (3,320 ) (15,423 ) Prepaid expenses (62 ) (169 ) Net deferred tax liability $ (554 ) $ (593 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Payments Under all Leases	Future minimum payments under all leases are as follows: Year ending December 31, Operating 2016 $ 599 2017 592 2018 468 2019 145 Balance at December 31, 2015 $ 1,804

Quarterly Financial Data (Una27

Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Results	Summary quarterly results for the two years ended December 31, 2015 are as follows (in thousands, other than share and per share data): Three Months Ended Full Year 2015 March 31 June 30 September 30 December 31 Revenue $ 8,910 $ 7,106 $ 5,346 $ 2,456 $ 23,818 Gross loss $ (5,109 ) $ (5,155 ) $ (3,891 ) $ (8,988 ) $ (23,143 ) Loss from operations $ (7,948 ) $ (8,322 ) $ (47,370 ) $ (12,309 ) $ (75,949 ) Loss before income taxes $ (8,312 ) $ (8,529 ) $ (48,859 ) $ (12,156 ) $ (77,856 ) Net loss $ (8,348 ) $ (8,580 ) $ (48,196 ) $ (12,706 ) $ (77,830 ) Basic and diluted loss per common share $ (0.32 ) $ (0.33 ) $ (1.84 ) $ (0.49 ) $ (2.98 ) Weighted average common shares outstanding used in computing net loss per common share, basic and diluted: 26,129,276 26,142,261 26,160,308 26,192,838 26,156,170 Three Months Ended Full Year 2014 March 31 June 30 September 30 December 31 Revenue $ 14,268 $ 14,469 $ 8,036 $ 8,912 $ 45,685 Gross loss $ (7,494 ) $ (7,274 ) $ (9,460 ) $ (5,459 ) $ (29,687 ) Loss from operations $ (10,925 ) $ (10,179 ) $ (13,872 ) $ (8,637 ) $ (43,613 ) Loss before income taxes $ (10,888 ) $ (9,984 ) $ (14,011 ) $ (9,032 ) $ (43,915 ) Net loss $ (10,894 ) $ (9,984 ) $ (13,713 ) $ (9,402 ) $ (43,993 ) Basic and diluted loss per common share $ (0.43 ) $ (0.39 ) $ (0.53 ) $ (0.36 ) $ (1.70 ) Weighted average common shares outstanding used in computing net loss per common share, basic and diluted: 25,317,147 25,706,797 26,110,651 26,127,026 25,815,405

Summary of Significant Accoun28

Summary of Significant Accounting Policies - Summary of Restricted Cash (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 170	$ 183
Certificates of Deposit [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	5	5
Flexible Spending Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	2	4
Fixed Deposit Pledge [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 163	$ 174

Summary of Significant Accoun29

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Impairment of investments		$ 0	$ 0
Reduced inventory and increased costs of goods sold		202,000	2,400,000	$ 604,000
Based on these sales prices reduced inventory and increased cost of goods sold	$ 2,800,000	3,900,000	1,700,000	421,000
Based on the Company's review of the current outlook of volume and pricing ,reduced raw material inventory and increased cost of goods sold		2,200,000
Depreciation and amortization expense associated with property and equipment		11,404,000	13,637,000	12,660,000
Deposit at a financial institution	2,900,000	2,900,000	1,500,000
Revenue recorded from government contract		661,000	689,000	1,400,000
Total value of the contract	$ 4,700,000	4,700,000
Value of contract recorded		4,000,000
Research and development costs		$ 2,210,000	1,861,000	$ 2,263,000
Income tax benefit recognition criteria percentage threshold		50.00%
Interest or penalties related to income taxes accrued or recognized		$ 0	$ 0
Period of exemption from Malaysian income tax		5 years
Renewal period of exemption from Malaysian income tax		5 years

Summary of Significant Accoun30

Summary of Significant Accounting Policies - Activity of Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	$ 140	$ 50
Charges to costs and expenses	235	105
Accounts charged off, less recoveries	14	(15)
Ending balance	$ 389	$ 140

Summary of Significant Accoun31

Summary of Significant Accounting Policies - Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Inventory, Net [Abstract]
Raw materials	$ 7,346	$ 14,503
Work in progress	9,920	6,357
Finished goods	4,067	1,879
Inventories	$ 21,333	$ 22,739

Summary of Significant Accoun32

Summary of Significant Accounting Policies - Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Total cost	$ 90,983	$ 177,248
Accumulated depreciation and amortization	(33,414)	(69,572)
Property and equipment, net	57,569	107,676
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	4,133	4,133
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total cost	26,097	32,482
Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Total cost	50,364	127,158
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	7,141	7,640
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Total cost	816	961
Information Systems [Member]
Property, Plant and Equipment [Line Items]
Total cost	1,105	1,140
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 1,327	$ 3,734

Summary of Significant Accoun33

Summary of Significant Accounting Policies - Property and Equipment, Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2015
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	39 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	Lesser of life of lease or economic life
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Information Systems [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Minimum [Member] | Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member] | Machinery, Equipment and Tooling [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years

Summary of Significant Accoun34

Summary of Significant Accounting Policies - Product Warranty Liability (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Balance, beginning of period	$ 97	$ 141
Charged to cost of sales	90	407
Actual product warranty expenditures	(114)	(451)
Balance, end of period	$ 73	$ 97

Summary of Significant Accoun35

Summary of Significant Accounting Policies - Components of Comprehensive Loss (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification of unrealized gain included in net loss	$ 0	$ 388
Unrealized loss on investments, net of tax	(17)	(415)
Unrealized loss on currency translation	(16)	(16)
Ending Balance	$ (33)	$ (43)

Summary of Significant Accoun36

Summary of Significant Accounting Policies - Anti-Dilutive Securities Excluded from Calculation of Diluted Net Loss Per Share (Detail)	12 Months Ended
	Dec. 31, 2014shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net loss per share	50,436
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net loss per share	4,146
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net loss per share	46,290

Segment Information - Additiona

Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015Segment
Segment Reporting [Abstract]
Number of reportable segment	1

Segment Information - Summary o

Segment Information - Summary of Revenue by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,456	$ 5,346	$ 7,106	$ 8,910	$ 8,912	$ 8,036	$ 14,469	$ 14,268	$ 23,818	$ 45,685	$ 41,513
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									5,499	19,857	14,844
Korea [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									3,646	5,001	2,214
Taiwan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									3,490	9,843	7,361
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									3,718	925	436
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									4,894	5,452	4,444
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									785	1,169	455
Australia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									913	716	10,368
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									342	1,517	309
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									9	229	745
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 522	$ 976	$ 337

Segment Information - Summary39

Segment Information - Summary of Sales by Product Type (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Product Information [Line Items]
Revenue	$ 2,456	$ 5,346	$ 7,106	$ 8,910	$ 8,912	$ 8,036	$ 14,469	$ 14,268	$ 23,818	$ 45,685	$ 41,513
Core [Member]
Product Information [Line Items]
Revenue									11,444	29,862	23,294
Wafer [Member]
Product Information [Line Items]
Revenue									6,627	8,077	12,239
Optical [Member]
Product Information [Line Items]
Revenue									5,086	7,057	4,523
Research & Development [Member]
Product Information [Line Items]
Revenue									$ 661	$ 689	$ 1,457

Segment Information - Summary40

Segment Information - Summary of Assets by Geographic Region (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 119,242	$ 194,906
United States [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	88,916	156,105
Malaysia [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	30,276	38,765
Other [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 50	$ 36

Investments - Additional Inform

Investments - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Trading Securities and Other Trading Assets [Line Items]
Short-term investments	$ 8,895	$ 20,562
Time deposits of cash and cash equivalents	3,500	$ 2,400
FDIC Guaranteed Certificates of Deposit [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Short-term investments	1,900
Corporate Notes/Bonds [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Short-term investments	$ 7,000

Investments - Amortized Cost an

Investments - Amortized Cost and Gross Unrealized Gains and Losses on All Securities (Detail) - Short-term Investments [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 8,900	$ 20,578
Gross Unrealized Gains	0	0
Gross Unrealized Losses	5	16
Fair Value	8,895	20,562
FDIC Guaranteed Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,920	2,120
Gross Unrealized Gains	0	0
Gross Unrealized Losses		2
Fair Value	1,920	2,118
Corporate Notes/Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,980	18,458
Gross Unrealized Gains	0	0
Gross Unrealized Losses	5	14
Fair Value	$ 6,975	$ 18,444

Investments - Summarized Financ

Investments - Summarized Financial Assets Measured at Fair Value on Recurring Basis (Detail) - Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sales securities - current	$ 26,597	$ 42,525
Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sales securities - current	17,702	21,963
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sales securities - current	8,895	20,562
Money Market Funds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash Equivalents	17,702	21,963
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash Equivalents	17,702	21,963
FDIC Guaranteed Certificates of Deposit [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sales securities - current	1,920	2,118
FDIC Guaranteed Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sales securities - current	1,920	2,118
Corporate Notes/Bonds [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sales securities - current	6,975	18,444
Corporate Notes/Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sales securities - current	$ 6,975	$ 18,444

Significant Customers - Additio

Significant Customers - Additional Information (Detail) - Customer	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue, Major Customer [Line Items]
Number of significant customer	2	2	2
Trade receivables	10.00%
Accounts receivable	48.00%	50.00%
Customer One [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenue	16.00%	24.00%	27.00%
Customer Two [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenue	15.00%	12.00%	17.00%

Asset Impairment Charges - Addi

Asset Impairment Charges - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Property, Plant and Equipment [Abstract]
Asset impairment charges	$ 39,597

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Mar. 20, 2014	Jan. 13, 2014	Dec. 31, 2015	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Common stock reserved for issuance upon exercise of outstanding common stock options and vesting of restricted stock units			3,305,589
Common stock reserved for future grants of stock options and restricted stock units			732,270
Common stock reserved for future exercise of outstanding warrants			24,380
Issue of common stock shares	2,875,000	3,047,500
Number of shares sold pursuant to full exercise of underwriter's over allotment option	375,000	397,500
Exercise price of shares	$ 13	$ 10.65
Gross proceeds from public offering	$ 4,900	$ 32,500		$ 34,957
Net proceeds from public offering	4,400	30,300
Underwriting of Discount and expense	319	$ 2,300
Estimated costs of public offering	$ 148
Outstanding warrants to purchase common stock			24,380	267,826
Outstanding warrants to purchase common stock at exercise price per share			$ 3.65	$ 3.65
Warrants exercisable date of issuance			10 years
Number of warrants expired			243,336
Repurchase of company shares			0	0

Stock Incentive Plans - Additio

Stock Incentive Plans - Additional Information (Detail) - USD ($)	Aug. 02, 2011	Jun. 22, 2011	Sep. 30, 2014	Oct. 31, 2013	Dec. 31, 2014	Dec. 31, 2015	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share of common stock purchased	1
Weighted average fair value of the options vested										$ 1,300,000	$ 2,900,000	$ 4,800,000
Intrinsic value of options outstanding					$ 0	$ 0				0	0
Intrinsic value of options exercisable					$ 0	0				0	0
Stock compensation expense										731,000	$ 840,000	$ 1,200,000
Unrecognized compensation expense related to non vested awards						$ 1,400,000				$ 1,400,000
Stock-based plan expect to recognize weighted-average period										2 years 10 months 2 days
Restrict shares, cancelled											20,911
Stock options, cancelled										373,710	215,080	260,375
Stock options to purchase shares of common stock granted			300,000	14,450	235,650	900,084	92,600	39,300	82,815	992,684	574,950	97,265
Exercise price										$ 1.40	$ 5.04	$ 8.43
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense										$ 295,000	$ 448,000	$ 292,000
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to non vested awards						$ 661,000				$ 661,000
Stock-based plan expect to recognize weighted-average period										2 years 2 months 27 days
Stock compensation expense										$ 224,000	$ 120,000	$ 25,000
Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restrict shares, cancelled											20,911
Stock options, cancelled											31,274
Stock options to purchase shares of common stock granted												70,365
Exercise price												$ 7.97
Board of Directors [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options to purchase shares of common stock granted												47,050
2001 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares awarded or sold	1,449,667
Plan expiration date										Aug. 2, 2011
2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in maximum number of shares awarded or sold under 2007 plan		2,100,000
Minimum [Member] | 2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares awarded or sold		2,307,692
Maximum [Member] | 2007 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares awarded or sold		4,407,692

Stock Incentive Plans - Summary

Stock Incentive Plans - Summary of Activity of Stock Incentive and Equity Plans (Detail) - $ / shares	1 Months Ended		3 Months Ended	4 Months Ended	5 Months Ended	7 Months Ended		12 Months Ended
	Sep. 30, 2014	Oct. 31, 2013	Dec. 31, 2014	Dec. 31, 2015	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares available for grant
Shares available for grant, Beginning balance						2,240,103	2,200,604	1,772,529	2,240,103	2,200,604
Shares available for grant, Granted								(1,457,826)	(706,056)	(216,913)
Shares available for grant, Exercised								0	0	0
Shares available for grant, Canceled/forfeited								417,567	238,482	256,412
Shares available for grant, Ending balance			1,772,529	732,270				732,270	1,772,529	2,240,103
Number of options outstanding
Number of options outstanding, Beginning balance						1,926,070	2,117,110	2,238,286	1,926,070	2,117,110
Number of options outstanding, Granted	300,000	14,450	235,650	900,084	92,600	39,300	82,815	992,684	574,950	97,265
Number of options outstanding, Exercised								(5,692)	(47,654)	(27,930)
Number of options outstanding, Canceled/forfeited								(373,710)	(215,080)	(260,375)
Number of options outstanding, Ending balance			2,238,286	2,851,568				2,851,568	2,238,286	1,926,070
Weighted - average option exercise price
Weighted - average option exercise price, Beginning balance						$ 12.46	$ 13.32	$ 10.31	$ 12.46	$ 13.32
Weighted - average option exercise price, Granted								1.40	5.04	8.43
Weighted - average option exercise price, Exercised								0.78	5.37	5.02
Weighted - average option exercise price, Canceled/forfeited								10.02	16.72	18.31
Weighted - average option exercise price, Ending balance			$ 10.31	$ 7.07				$ 7.07	$ 10.31	$ 12.46
Number of restricted stock and board shares issued
Number of restricted stock shares issued, Beginning balance						133,639	59,932	140,653	133,639	59,932
Number of restricted stock shares issued, Granted								60,802	27,925	73,707
Number of restricted stock shares issued, Exercised								0	0	0
Number of restricted stock shares issued, Canceled/forfeited									(20,911)
Number of restricted stock shares issued, Ending balance			140,653	201,455				201,455	140,653	133,639
Restricted Stock Units [Member]
Number of restricted stock units outstanding
Number of restricted stock units outstanding, Beginning balance						45,941		134,731	45,941
Number of restricted stock units outstanding, Granted								404,340	103,181	45,941
Number of restricted stock units outstanding, Exercised								(29,432)	(10,525)
Number of restricted stock units outstanding, Canceled/forfeited								(55,618)	(3,866)
Number of restricted stock units outstanding, Ending balance			134,731	454,021				454,021	134,731	45,941

Stock Incentive Plans - Intrins

Stock Incentive Plans - Intrinsic Value Calculated Based on Grant Date Fair Value (Detail) - $ / shares	1 Months Ended		3 Months Ended	4 Months Ended	5 Months Ended	7 Months Ended		12 Months Ended
	Sep. 30, 2014	Oct. 31, 2013	Dec. 31, 2014	Dec. 31, 2015	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of options granted	300,000	14,450	235,650	900,084	92,600	39,300	82,815	992,684	574,950	97,265
Intrinsic value calculated based on grant date fair value, Exercise price	$ 4.30		$ 4.25	$ 1	$ 2.43	$ 7.69	$ 6.60
Intrinsic value calculated based on grant date fair value, Exercise price	5.20	$ 12.11	4.41	1.35	4.04	11.29	7.97
Intrinsic value calculated based on grant date fair value, Intrinsic value per share	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

Stock Incentive Plans - Exercis

Stock Incentive Plans - Exercise Prices of Outstanding Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices of outstanding options, Number of options outstanding	2,851,568	2,238,286	1,926,070	2,117,110
Exercise prices of outstanding options, Average remaining contractual life	6 years 5 months 1 day
Exercise prices of outstanding options, Number of options exercisable	1,599,607
$0.78 - $4.94 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices of outstanding options, Lower range	$ 0.78
Exercise prices of outstanding options, Upper range	$ 4.94
Exercise prices of outstanding options, Number of options outstanding	1,617,436
Exercise prices of outstanding options, Average remaining contractual life	7 years 9 months 29 days
Exercise prices of outstanding options, Number of options exercisable	488,681
$5.12 - $9.95 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices of outstanding options, Lower range	$ 5.12
Exercise prices of outstanding options, Upper range	$ 9.95
Exercise prices of outstanding options, Number of options outstanding	554,684
Exercise prices of outstanding options, Average remaining contractual life	5 years 3 months 15 days
Exercise prices of outstanding options, Number of options exercisable	439,526
$10.02 - $14.00 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices of outstanding options, Lower range	$ 10.02
Exercise prices of outstanding options, Upper range	$ 14
Exercise prices of outstanding options, Number of options outstanding	238,542
Exercise prices of outstanding options, Average remaining contractual life	3 years 11 months 12 days
Exercise prices of outstanding options, Number of options exercisable	230,494
$15.00 - $18.80 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices of outstanding options, Lower range	$ 15
Exercise prices of outstanding options, Upper range	$ 18.80
Exercise prices of outstanding options, Number of options outstanding	29,776
Exercise prices of outstanding options, Average remaining contractual life	2 years 11 months 23 days
Exercise prices of outstanding options, Number of options exercisable	29,776
$19.21 - $22.92 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices of outstanding options, Lower range	$ 19.21
Exercise prices of outstanding options, Upper range	$ 22.92
Exercise prices of outstanding options, Number of options outstanding	356,475
Exercise prices of outstanding options, Average remaining contractual life	4 years 11 days
Exercise prices of outstanding options, Number of options exercisable	356,475
$24.95 - $32.67 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise prices of outstanding options, Lower range	$ 24.95
Exercise prices of outstanding options, Upper range	$ 32.67
Exercise prices of outstanding options, Number of options outstanding	54,655
Exercise prices of outstanding options, Average remaining contractual life	4 years 6 months 4 days
Exercise prices of outstanding options, Number of options exercisable	54,655

Stock Incentive Plans - Summa51

Stock Incentive Plans - Summary of Non-vested Options (Detail) - $ / shares	1 Months Ended		3 Months Ended	4 Months Ended	5 Months Ended	7 Months Ended		12 Months Ended
	Sep. 30, 2014	Oct. 31, 2013	Dec. 31, 2014	Dec. 31, 2015	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Options
Options, Granted	300,000	14,450	235,650	900,084	92,600	39,300	82,815	992,684	574,950	97,265
Weighted-average exercise price
Weighted-average exercise price, Granted								$ 1.40	$ 5.04	$ 8.43
Weighted-average exercise price, Cancelled								$ 10.02	$ 16.72	$ 18.31
Non-vested Options [Member]
Options
Options, Non-vested, Beginning balance						326,566	821,002	628,733	326,566	821,002
Options, Granted								992,684	574,950	97,265
Options, Vested								(200,402)	(169,361)	(380,413)
Options, Cancelled								(169,054)	(103,422)	(211,288)
Options, Non-vested, Ending balance			628,733	1,251,961				1,251,961	628,733	326,566
Weighted-average exercise price
Weighted-average exercise price, Beginning balance						$ 13.57	$ 15.24	$ 5.93	$ 13.57	$ 15.24
Weighted-average exercise price, Granted								1.40	5.04	8.43
Weighted-average exercise price, Vested								6.64	14.84	12.50
Weighted-average exercise price, Cancelled								5.86	12.74	18.55
Weighted-average exercise price, Ending balance			$ 5.93	$ 2.23				$ 2.23	$ 5.93	$ 13.57

Stock Incentive Plans - Schedul

Stock Incentive Plans - Schedule for the Estimated Fair Value at Date of Option Grand Using Black Scholes Option Pricing Model (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Weighted average fair value per share of option	$ 1.40	$ 5.04	$ 8.49
Expected term	5 years 6 months	5 years 3 months 18 days	5 years 3 months 18 days
Risk free interest rate	1.41%	1.66%	0.76%
Risk free interest rate	1.70%	1.83%	1.42%
Volatility	65.00%	77.00%	77.00%
Dividend yield	0.00%	0.00%	0.00%
Forfeiture rate	18.56%	25.56%	19.18%

Stock Incentive Plans - Summa53

Stock Incentive Plans - Summary of Restricted Stock Units (Detail) - Restricted Stock Units [Member] - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested restricted stock, Beginning balance	134,731	45,941
Granted	404,340	103,181	45,941
Vested	(29,432)	(10,525)
Cancelled	(55,618)	(3,866)
Non-vested restricted stock, Ending balance	454,021	134,731	45,941
Weighted average price at time of grant, Beginning balance	$ 5.41	$ 8.60
Weighted average price at time of grant, Granted	1.48	4.43	$ 8.60
Weighted average price at time of grant, Vested	5.44	8.60
Weighted-average exercise price, Cancelled	5.37	8.60
Weighted average price at time of grant, Ending balance	$ 1.92	$ 5.41	$ 8.60
Aggregate intrinsic value, Ending balance	$ 517,584

Stock Incentive Plans - Analysi

Stock Incentive Plans - Analysis of Restricted Stock Units and Restricted Stock Issued (Detail) - Restricted Stock [Member] - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested restricted stock, Beginning balance	12,207	53,714	4,336
Granted	60,802	27,925	73,707
Vested	(57,809)	(48,521)	(24,329)
Cancelled		(20,911)
Non-vested restricted stock, Ending balance	15,200	12,207	53,714

Income Taxes - Income (Loss) Be

Income Taxes - Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
U.S.									$ (67,254)	$ (46,562)	$ (38,114)
Foreign									(10,602)	2,647	2,603
Loss before income taxes	$ (12,156)	$ (48,859)	$ (8,529)	$ (8,312)	$ (9,032)	$ (14,011)	$ (9,984)	$ (10,888)	$ (77,856)	$ (43,915)	$ (35,511)

Income Taxes - Income Tax Expen

Income Taxes - Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current
U.S.	$ 0	$ 0	$ 0
State	0	0	0
Foreign	13	6	6
Total current income tax expense	13	6	6
Deferred
U.S.		(218)	(5,863)
State		(36)	691
Foreign	(39)	326	6
Total deferred income tax expense (benefit)	(39)	72	(5,166)
Total income tax expense (benefit)	$ (26)	$ 78	$ (5,160)

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Income Tax Computed at Federal Statutory Rate to Income Before Taxes (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. Federal statutory rate	(34.00%)	(34.00%)	(34.00%)
State taxes net of federal benefit	(4.40%)	(5.70%)	(5.50%)
Foreign rate differential and transactional tax	1.20%	(0.50%)	(0.70%)
Impact of foreign tax holiday	3.40%	(1.50%)	(1.80%)
Valuation allowance	33.30%	41.80%	26.90%
Other	0.50%	0.10%	0.60%
Effective income tax rate		0.20%	(14.50%)

Income Taxes - Significant Comp

Income Taxes - Significant Components of Net Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for doubtful accounts	$ 152	$ 55
Inventory reserves	3,289	918
Accrued liabilities	382	57
Warrant interest expense	269	269
Stock compensation expense	2,478	2,689
State net operating loss-net of tax	7,456	5,923
Net operating loss carryforward	40,417	31,658
Tax credits	671	581
Valuation allowance	(52,286)	(27,151)
Total deferred tax assets	2,828	14,999
Deferred tax liability:
Depreciation	(3,320)	(15,423)
Prepaid expenses	(62)	(169)
Net deferred tax liability	$ (554)	$ (593)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Owned, Federal Income Tax Note [Line Items]
Decrease in current deferred tax assets	$ 1,300,000
Decrease in noncurrent deferred tax liabilities	$ 1,300,000
Valuation allowance		$ 52,286,000	$ 27,151,000
Income tax (expense) benefit			254,000
Investment tax credits and research and development credits scheduled to expire		2,017
Liability for uncertain tax positions		$ 2,600,000
Amount of unrecognized or expected tax benefits recorded in financial statement		1,100,000	1,100,000
Penalties related to income taxes		0	0	$ 0
Unrecognized potential tax benefits		$ 1,000,000
Number of period for which income tax is exempted		5 years
Decreased foreign taxes		$ 147,000	$ 335,000	$ 651,000
Benefit of tax holiday on net income per share (diluted)		$ 0.01	$ 0.01	$ 0.03
Tax holiday additional renewal period		5 years
Cumulative undistributed earnings of foreign subsidiaries		$ 11,000,000
Federal [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Net operation loss deduction		$ 143,500,000
Operating loss carry forwards expiration year		2,021
Tax credit carry forward amount		$ 525,000
Deferred tax asset		21,700,000
State and Local Jurisdiction [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Net operation loss deduction		$ 174,800,000
Operating loss carry forwards expiration year		2,019
Deferred tax asset		$ 26,400,000
Research [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Tax credit carry forward amount		173,000
Investment Credit [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Tax credit carry forward amount		$ 68,600
Malaysia [Member]
Investments, Owned, Federal Income Tax Note [Line Items]
Number of period for which income tax is exempted		5 years

Credit Facility - Additional In

Credit Facility - Additional Information (Detail) - USD ($)	Jan. 02, 2013	Aug. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Term agreement of senior secured credit facility	3 years
Amount of senior secured credit facility	$ 25,000,000
Percentage of eligible account receivable	80.00%
Percentage of domestically held raw material and finished goods inventory	35.00%
Percentage of advances against inventory	40.00%	45.00%
Amount of aggregate outstanding principal on the revolving line of credit	$ 10,000,000	$ 10,000,000
Option to borrow at an interest rate of LIBOR plus	2.75%
Option to borrow at an interest rate of Wall Street Journal prime rate plus	0.50%
Liquidity rate	$ 20,000,000
Borrowing interest rate options	2.25%		2.25%
Available borrowing capacity			$ 2,300,000
Percentage of unused revolving line facility fee	0.375%	0.50%
Adjusted quick ratio	1.40
Percentage of maintain operating and other deposit accounts	25.00%
Interest expense			109,000	$ 95,000	$ 95,000
Borrowed amount			1,500,000
Interest expense charged on the unused portion of the facility			$ 107,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	Feb. 17, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Net rent expense under operating leases		$ 653,400	$ 1,000,000	$ 1,100,000
Cost of purchasing equipment or components		6,100,000
Settlement expenses		$ 1,100,000
Subsequent Event [Member]
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Settlement expenses	$ 900,000

Commitments and Contingencies62

Commitments and Contingencies - Future Minimum Payments Under all Leases (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,016	$ 599
2,017	592
2,018	468
2,019	145
Balance at December 31, 2015	$ 1,804

Benefit Plan - Additional Infor

Benefit Plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Postemployment Benefits [Abstract]
Employee's age limit to participate in the benefit Plan	18 years
Employer matching contributions	$ 0	$ 0	$ 0

Quarterly Financial Data (Una64

Quarterly Financial Data (Unaudited) - Summary of Quarterly Results (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Revenue	$ 2,456	$ 5,346	$ 7,106	$ 8,910	$ 8,912	$ 8,036	$ 14,469	$ 14,268	$ 23,818	$ 45,685	$ 41,513
Gross loss	(8,988)	(3,891)	(5,155)	(5,109)	(5,459)	(9,460)	(7,274)	(7,494)	(23,143)	(29,687)	(21,921)
Loss from operations	(12,309)	(47,370)	(8,322)	(7,948)	(8,637)	(13,872)	(10,179)	(10,925)	(75,949)	(43,613)	(34,884)
Loss before income taxes	(12,156)	(48,859)	(8,529)	(8,312)	(9,032)	(14,011)	(9,984)	(10,888)	(77,856)	(43,915)	(35,511)
Net loss	$ (12,706)	$ (48,196)	$ (8,580)	$ (8,348)	$ (9,402)	$ (13,713)	$ (9,984)	$ (10,894)	$ (77,830)	$ (43,993)	$ (30,351)
Basic and diluted loss per common share	$ (0.49)	$ (1.84)	$ (0.33)	$ (0.32)	$ (0.36)	$ (0.53)	$ (0.39)	$ (0.43)	$ (2.98)	$ (1.70)
Weighted average common shares outstanding used in computing net loss per common share, basic and diluted:	26,192,838	26,160,308	26,142,261	26,129,276	26,127,026	26,110,651	25,706,797	25,317,147	26,156,170	25,815,405