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