Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 83,217	$ (37,091)	$ (12,395)
Other comprehensive income (loss), net of tax:
Foreign currency translation	3	(6)	(2)
Total other comprehensive income (loss), net of tax	3	(6)	(2)
Comprehensive income (loss)	$ 83,220	$ (37,097)	$ (12,397)