Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Impairment of investments	$ 0	$ 0
Reduced inventory and increased costs of goods sold	604,000	719,000
Based on these sales prices reduced inventory and increased cost of goods sold	421,000	1,500,000
The recycling of boules reduced inventory and increased cost of goods sold		927,000
Depreciation and amortization expense associated with property and equipment	12,660,000	12,027,000	9,724,000
Impairment losses on long lived assets	0	0	0
Deposit at a financial institution	4,800,000	6,900,000
Revenue was recorded from Government contract	2,700,000	1,200,000
Total value of the contract	4,700,000
Period of contract	3 years
Research and development costs	2,263,000	2,274,000	1,806,000
Income tax benefit recognition criteria percentage threshold	50.00%
Potential penalties related to income taxes	0	0	11,000
Interest or penalties related to income taxes accrued or recognized	0	0
Period of exemption from Malaysian income tax	10 years
Certificates of Deposit [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted certificates of deposit	5,000	5,000
Employee Fund [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted certificates of deposit	7,800	2,600
Interest-bearing Deposits [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted certificates of deposit	$ 152,300	$ 163,500