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Quarterly financial information (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
CONSOLIDATED STATEMENTS OF OPERATIONS
Revenues	$ 33,858	$ 28,635	$ 31,522	$ 26,759	$ 21,646	$ 18,717	$ 18,958	$ 18,086	$ 120,774	$ 77,407
Cost of revenues	15,118	12,818	16,167	13,490	10,626	9,217	9,885	8,509	57,593	38,237
Gross profit	18,740	15,817	15,355	13,269	11,020	9,500	9,073	9,577	63,181	39,170
Total operating expenses	16,998	14,927	15,737	14,535	10,646	9,890	9,342	9,927	62,197	39,805
Operating loss	1,742	890	(382)	(1,266)	374	(390)	(269)	(350)	984	(635)
Other expense, net	(1,697)	(1,798)	(1,485)	(3,979)	(849)	(274)	(463)	(400)	(8,959)	(1,986)
Loss from continuing operations before income taxes	45	(908)	(1,867)	(5,245)	(475)	(664)	(732)	(750)	(7,975)	(2,621)
Income tax expense (benefit)	(3,260)	(652)	(369)	605	(464)	(19)	(115)	(7)	(3,676)	(605)
Net (loss) income from continuing operations	3,305	(256)	(1,498)	(5,850)	(11)	(645)	(617)	(743)	(4,299)	(2,016)
Income (loss) from discontinued operations	(443)	0	34	1,786	1,010	228	236	(323)	1,377	1,151
Net income (loss)	$ 2,862	$ (256)	$ (1,464)	$ (4,064)	$ 999	$ (417)	$ (381)	$ (1,066)	$ (2,922)	$ (865)
(Loss) earnings per share:
Basic (loss) earnings per common share from continuing operations	$ 0.09	$ (0.01)	$ (0.04)	$ (0.16)	$ 0	$ (0.02)	$ (0.02)	$ (0.02)	$ (0.12)	$ (0.06)
Basic earnings (loss) per common share from discontinued operations	(0.01)	0	0	0.05	0.03	0.01	0.01	(0.01)	0.04	0.03
Basic (loss) earnings per common share	0.08	(0.01)	(0.04)	(0.11)	0.03	(0.01)	(0.01)	(0.03)	(0.08)	(0.02)
Diluted (loss) earnings per common share from continuing operations	0.09	(0.01)	(0.04)	(0.16)	0	(0.02)	(0.02)	(0.02)	(0.12)	(0.06)
Diluted earnings (loss) per common share from discontinued operations	(0.01)	0	0	0.05	0.03	0.01	0.01	(0.01)	0.04	0.03
Diluted (loss) earnings per common share	$ 0.08	$ (0.01)	$ (0.04)	$ (0.11)	$ 0.03	$ (0.01)	$ (0.01)	$ (0.03)	$ (0.08)	$ (0.02)

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