Accrued Liabilities - Summary of Accrued Warranty Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Payables And Accruals [Abstract]
Balance at January 1,	$ 2,321	$ 1,470
Warranty liabilities assumed from acquisitions		450
Amortization of fair value adjustment of warranty liabilities acquired through acquisitions	(57)	(12)	$ (164)
Reduction of warranty liabilities assumed in connection with acquisitions	(384)	(174)
Warranty expense	493	827
Warranty charges	(531)	(240)
Balance at December 31,	$ 1,842	$ 2,321	$ 1,470