Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Payables and Accruals [Abstract]
Accrued salaries, benefits and bonus	$ 6,474	$ 3,637
Accrued professional, consulting and lobbying	3,673	1,098
Accrued warranty expense	780	314	$ 675	$ 955
Accrued income and other taxes	4,581	1,215
Other accrued expenses	2,740	2,379
Accrued liabilities	$ 18,248	$ 8,643