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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Sep. 30, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 31, 2017 | Mar. 30, 2016 | Dec. 28, 2015 | Dec. 31, 2014
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  |  | 34.00% | 34.00% | 34.00% |  |  |  |
Tax benefit recognized |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  |
AMT credit carryforwards |  |  |  | 736,000 |  |  |  |  |  |
Unremitted earnings reversed |  |  |  |  |  | 274,000 |  |  |  |
Recognized tax benefit, voluntary disclosure agreements with several states |  |  |  |  |  | 555,000 |  |  |  |
Gain from equity method investment |  |  |  |  |  | 5,000,000 |  |  |  |
Provisional tax benefit due to new Tax Act |  |  |  | 122,000 |  |  |  |  |  |
Untaxed accumulated unremitted foreign earnings |  |  |  | 813,000 |  |  |  |  |  |
Valuation allowance, deferred tax assets |  |  |  | 33,024,000 | 29,274,000 |  |  |  |  |
Increases in equity of realization of deferred tax assets valuation allowance |  |  |  |  |  |  | $ 3,485,000 |  |  |
Research and development tax credit carryforwards |  |  |  | 20,019,000 | 13,967,000 |  |  |  |  |
Accrued interest |  |  |  | 1,104,000 | 946,000 | 830,000 |  |  |  | $ 1,254,000
Net interest expense |  |  |  | 6,000 | 6,000 | $ 21,000 |  |  |  |
Potential payment of interest |  |  |  | 29,000 | $ 25,000 |  |  |  |  |
Scenario, Plan [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  | 21.00% |  |  |  |  |  |  |
Great Wall Semiconductor Corporation (GWS) [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Gain from equity method investment |  | $ 4,999,719 |  | $ 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% |
Converpower Corporation [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent in certain operating assets and cash | 100.00% |  |  |  |  |  |  | 100.00% |  |
Unremitted earnings reversed | $ 55,000 |  |  |  |  |  |  |  |  |
Sale of ownership interest |  |  |  |  |  |  |  | 49.00% |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax examination period |  |  |  | 3 years |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Effective income tax rate |  |  |  | 35.00% |  |  |  |  |  |
Income tax examination period |  |  |  | 7 years |  |  |  |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  |  |  | 2033 |  |  |  |  |  |
Research and development tax credit carryforwards |  |  |  | $ 11,711,000 |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | $ 18,351,000 |  |  |  |  |  |
Certain States [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Federal net operating loss carryforwards expiry, beginning year |  |  |  | 2018 |  |  |  |  |  |
Federal net operating loss carryforwards expiry, ending year |  |  |  | 2037 |  |  |  |  |  |
Research and development tax credit carryforwards |  |  |  | $ 11,714,000 |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | $ 28,770,000 |  |  |  |  |  |

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