Other Income - Schedule of Other Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Income and Expenses [Abstract]
Foreign currency gains	$ 55	$ 256	$ 140	$ 19
Tax indemnification income	490	140	980	436
Other income	7	5	9	11
Total other income	$ 552	$ 401	$ 1,129	$ 466