Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net loss		$ (6,293)	$ (31,260)	$ (8,177)
Currency translation adjustment—net of tax	[1]	1,513	(41)	508
Net unrealized (gain) loss on derivatives—net of tax	[2]	(5,325)	1,189	330
Other comprehensive income (loss)—net of tax		(3,812)	1,148	838
Comprehensive loss		$ (10,105)	$ (30,112)	$ (7,339)

[1] Net of income tax (provision) benefit of (1,017), $44 and (338) for the years ended December 31, 2018, 2017 and 2016, respectively.

[2] Net of income tax benefit of $775, $1,048 and $216 for the years ended December 31, 2018, 2017 and 2016, respectively.