Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (31,260)	$ (8,177)	$ (6,189)
Currency translation adjustment—net of tax	[1]	(41)	508	(1,249)
Net unrealized loss on derivatives—net of tax	[2]	1,189	330
Other comprehensive income (loss)—net of tax		1,148	838	(1,249)
Comprehensive loss		$ (30,112)	$ (7,339)	$ (7,438)

[1] Net of income tax (provision) benefit of $44, $(338) and $827 for the years ended December 31, 2017, 2016 and 2015, respectively.

[2] Net of income tax benefit of $1,048 and $216 for the years ended December 31, 2017 and 2016, respectively.