Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Total net revenues	$ 32,253	$ 31,695	$ 29,292	$ 32,349	$ 33,321	$ 36,872	$ 34,591	$ 37,341	$ 125,589	$ 142,125	$ 156,684
Gross profit (loss)	5,640	(3,597)	5,527	7,690	8,139	11,086	10,636	12,911	15,260	42,773	57,913
Net income (loss)	$ (5,285)	$ (18,036)	$ (5,217)	$ (10,279)	$ (65,840)	$ 69	$ 322	$ 484	$ (38,816)	$ (64,964)	$ 3,871
Basic earnings (loss) per share	$ (0.41)	$ (1.41)	$ (0.41)	$ (0.81)	$ (5.22)	$ 0.01	$ 0.03	$ 0.04	$ (3.04)	$ (5.48)	$ 0.36
Diluted earnings (loss) per share	$ (0.41)	$ (1.41)	$ (0.41)	$ (0.81)	$ (5.22)	$ 0.01	$ 0.02	$ 0.04	$ (3.04)	$ (5.48)	$ 0.29