Deferred Grants - Schedule of Deferred Grants (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Revenue Arrangement [Line Items]
Total deferred grants	$ 5,039	$ 5,317
Less: Property grants - short-term	0	0
Less: Lease grants - short-term	(80)
Less: Employment grants - short-term	(149)	(207)
Total long-term deferred grants	4,810	5,110
Total deferred grants	5,039	5,317
Other Long-Term Liabilities [Member]
Deferred Revenue Arrangement [Line Items]
Property grants	4,377	5,110
Lease grants	513
Other Accrued Expenses and Current Liabilities [Member]
Deferred Revenue Arrangement [Line Items]
Employment grants	$ 149	$ 207