Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Total net revenues	$ 17,252	$ 17,813	$ 17,033	$ 24,472	$ 26,687	$ 28,552	$ 27,142	$ 31,604	$ 76,570	$ 113,981	$ 125,589
Gross profit (loss)	5,860	6,423	6,040	5,357	5,522	5,907	5,384	5,757	23,680	22,569	15,260
Net income (loss)	$ (937)	$ (448)	$ (1,374)	$ (4,061)	$ (3,177)	$ (1,739)	$ (4,953)	$ (5,360)	$ (6,820)	$ (15,229)	$ (38,816)
Basic earnings (loss) per share	$ (0.07)	$ (0.03)	$ (0.10)	$ (0.31)	$ (0.24)	$ (0.13)	$ (0.38)	$ (0.41)	$ (0.52)	$ (1.17)	$ (3.04)
Diluted earnings (loss) per share	$ (0.07)	$ (0.03)	$ (0.10)	$ (0.31)	$ (0.24)	$ (0.13)	$ (0.38)	$ (0.41)	$ (0.52)	$ (1.17)	$ (3.04)