Accrued Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued salaries, benefits and bonus	$ 5,465	$ 6,474
Accrued professional, consulting and lobbying	1,079	3,673
Accrued warranty expense	347	780	$ 449	$ 314
Accrued income and other taxes	7,415	4,581
Other accrued liabilities	6,024	2,740
Accrued liabilities	$ 20,330	$ 18,248