Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued salaries, benefits and bonus	$ 5,286	$ 3,637
Accrued professional, consulting and lobbying	1,807	1,098
Accrued warranty expense	748	314	$ 401	$ 675
Accrued income and other taxes	2,169	1,215
Other accrued liabilities	6,076	2,379
Accrued liabilities	$ 16,086	$ 8,643