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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 30, 2016 | Dec. 28, 2015 | Dec. 31, 2013
Income Tax Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Tax benefit recognized |  |  |  | $ 0 | $ 0 | $ 0 |  |  |
Unremitted earnings reversed |  |  |  |  | 274,000 |  |  |  |
Recognized tax benefit, voluntary disclosure agreements with several states |  |  |  |  | 555,000 |  |  |  |
Benefit for income taxes |  |  | $ 552,000 |  |  |  |  |  |
Gain from equity method investment |  |  |  |  | 5,000,000 |  |  |  |
Unremitted earnings of international subsidiaries |  |  |  | 909,000 |  |  |  |  |
Unrecognized deferred tax liability |  |  |  | 80,000 |  |  |  |  |
Valuation allowance, deferred tax assets |  |  |  | 29,274,000 | 25,862,000 |  |  |  |
Increases in equity of realization of deferred tax assets net of valuation allowance |  |  |  | 3,485,000 |  |  |  |  |
Accrued interest |  |  |  | 946,000 | 830,000 | 1,254,000 |  |  | $ 2,072,000
Net interest expense |  |  |  | 6,000 | 21,000 | $ 32,000 |  |  |
Potential payment of interest |  |  |  | $ 25,000 | $ 24,000 |  |  |  |
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% |
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] |  |  |  |  |  |  |  |  |
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 |  |  |  | 2017 |  |  |  |  |
Federal net operating loss carryforwards expiry, ending year |  |  |  | 2036 |  |  |  |  |

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28446-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28511-109314 + Details
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