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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 28, 2015 | Mar. 31, 2013 | Dec. 31, 2012
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Tax benefit recognized |  |  | $ 0 | $ 0 |  |  |  |
Recognized tax benefit, voluntary disclosure agreements with several states |  |  | 555,000 |  |  |  |  |
Unremitted earnings reversed |  |  | $ 274,000 |  |  |  |  |
Benefit for income taxes |  | $ 552,000 |  |  |  |  |  |
Research tax credit carry forward extension period |  |  | 2 years |  |  |  |  |
Federal research tax credit recorded |  |  |  |  |  |  | $ 549,000 |
Unremitted earnings of international subsidiaries |  |  | $ 841,000 |  |  |  |  |
Unrecognized deferred tax liability |  |  | 37,000 |  |  |  |  |
Gain from equity method investment |  |  | 5,000,000 |  |  |  |  |
Valuation allowance, deferred tax assets |  |  | 25,862,000 | 25,818,000 |  |  |  |
Deferred tax assets valuation allowance increase |  |  |  |  | $ 10,241,000 |  |  |
Amount generated in cash refund |  |  |  | 1,600,000 |  |  |  |
Increases in equity of realization of deferred tax assets |  |  | 3,216,000 |  |  |  |  |
Accrued interest |  |  | 830,000 | 1,254,000 | 2,072,000 |  |  | $ 1,506,000
Net interest (benefit) expense |  |  | 21,000 | 32,000 | $ (28,000) |  |  |
Potential payment of interest |  |  | $ 24,000 | $ 181,000 |  |  |  |
Great Wall Semiconductor Corporation (GWS) [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Gain from equity method investment | $ 4,999,719 |  |  |  |  |  |  |
Gain from equity method investment for income tax purpose | 4,999,719 |  |  |  |  |  |  |
Gain (loss) on transaction for income tax purpose | $ 0 |  |  |  |  |  |  |
Aegis Power Systems Inc [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Sale of ownership interest |  |  | 49.00% |  |  | 49.00% |  |
Minimum [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Income tax examination period |  |  | 3 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Income tax examination period |  |  | 7 years |  |  |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  |  | 2033 |  |  |  |  |
Certain States [Member] |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  |  | 2016 |  |  |  |  |
Federal net operating loss carryforwards expiry, ending year |  |  | 2035 |  |  |  |  |

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