Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 19,636	$ 16,564	$ 18,216	$ 13,622	$ 19,656	$ 13,478	$ 12,430	$ 9,601	$ 68,038	$ 55,165	$ 43,799
Gross profit	15,349	13,145	14,748	11,171	16,844	11,610	11,294	8,573	54,413	48,321	40,351
Income (loss) from continuing operations, net of income taxes	(389)	(2,801)	(1,484)	(4,333)	1,438	(1,581)	(2,960)	(6,127)	(9,007)	(9,230)	(19,700)
Total income (loss) from discontinued operations, net of income taxes					(1)	0	(161)	26	0	(136)	21,927
Net income (loss)	$ (389)	$ (2,801)	$ (1,484)	$ (4,333)	$ 1,437	$ (1,581)	$ (3,121)	$ (6,101)	$ (9,007)	$ (9,366)	$ 2,227
Net income (loss) per share - basic and diluted
Loss from continuing operations, net of income taxes (usd per share)	$ (0.01)	$ (0.06)	$ (0.03)	$ (0.10)					$ (0.20)	$ (0.18)	$ (0.39)
Income from discontinued operations, net of income taxes (usd per share)									0	0	0.43
Net income (loss) (usd per share)	$ (0.01)	$ (0.06)	$ (0.03)	$ (0.10)					$ (0.20)	$ (0.18)	$ 0.04
Net earnings (loss) per share - basic
Loss from continuing operations, net of income taxes (usd per share)					$ 0.03	$ (0.03)	$ (0.06)	$ (0.12)
Income (loss) from discontinued operations, net of income taxes (usd per share)					0	0	0	0
Net income (loss) (usd per share)					0.03	(0.03)	(0.06)	(0.12)
Net earnings (loss) per share - diluted
Income (loss) from continuing operations, net of income taxes (usd per share)					0.03	(0.03)	(0.06)	(0.12)
Income from discontinued operations, net of income taxes (usd per share)					0	0	0	0
Net income (loss) (usd per share)					$ 0.03	$ (0.03)	$ (0.06)	$ (0.12)
Weighted-average number of shares of common stock outstanding:
Weighted-average number of shares of common stock outstanding - basic (shares)					50,278,668	52,716,626	52,241,605	51,827,685
Weighted-average number of shares of common stock outstanding - diluted (shares)					51,266,321	52,716,626	52,241,605	51,827,685
Basic and diluted weighted-average number of shares outstanding (shares)	46,710,402	46,158,465	45,702,810	44,831,453					45,864,500	51,764,506	50,511,366