Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Impairment of investments	$ 0	$ 0
Based on these sales prices reduced inventory and increased cost of goods sold	1,100,000	3,900,000
Based on excess and obsolete adjustment, reduced inventory and increased cost of goods sold	2,300,000
Depreciation and amortization expense associated with property and equipment	6,100,000	11,404,000
Deposit at a foreign financial institution	525,000	419,000
Deposit at a financial institution	6,000,000	2,900,000
Revenue recorded from government contract	289,000	661,000
Total value of the contract	4,700,000
Value of contract recorded	4,300,000
Estimated cost for completion	217,000
Research and development costs	$ 2,550,000	2,210,000
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
Consumables [Member]
Summary Of Significant Accounting Policies [Line Items]
Consumable Write Down	$ 3,200,000
Discontinuation from LED Market [Member]
Summary Of Significant Accounting Policies [Line Items]
Based on excess and obsolete adjustment, reduced inventory and increased cost of goods sold	$ 4,000,000