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