Revision and Immaterial Correction of an Error in Previously Issued Financial Statements, Effect of Error Correction on Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Goodwill	$ 13,339	$ 13,339	$ 13,339	$ 13,339	$ 13,170	$ 8,431
Intangible assets, net	12,308	11,672	11,076	10,479	6,080
Total assets	71,363	68,844	63,605	58,509	61,440
Stockholders' equity:
Accumulated deficit	(46,866)	(47,082)	(48,304)	(54,654)	(42,569)
Total liabilities and stockholders' equity	71,363	68,844	63,605	58,509	61,440
Operating expenses:
Amortization of definite-lived intangible assets	570	1,208	1,804	2,400	1,612
Loss before income taxes	(6,145)	(5,955)	(6,610)	(6,352)	777
Net loss	$ (4,297)	$ (4,513)	$ (5,736)	$ (12,085)	$ (354)
Basic loss per common share	$ (0.22)	$ (0.23)	$ (0.28)	$ (0.60)	$ (0.02)
Diluted loss per common share	$ (0.22)	$ (0.23)	$ (0.28)	$ (0.60)	$ (0.02)
Consolidated statement of shareholder's equity [Abstract]
Net loss	$ (4,297)	$ (4,513)	$ (5,736)	$ (12,085)	$ (354)
As Reported [Member]
Assets
Goodwill	16,709	16,709	16,709
Intangible assets, net	8,999	8,454	7,960
Total assets	71,424	68,996	63,859
Stockholders' equity:
Accumulated deficit	(46,805)	(46,930)	(48,050)
Total liabilities and stockholders' equity	71,424	68,996	63,859
Operating expenses:
Amortization of definite-lived intangible assets	509	1,056	1,550
Loss before income taxes	(6,084)	(5,803)	(6,356)
Net loss	$ (4,236)	$ (4,361)	$ (5,482)
Basic loss per common share	$ (0.21)	$ (0.22)	$ (0.27)
Diluted loss per common share	$ (0.21)	$ (0.22)	$ (0.27)
Consolidated statement of shareholder's equity [Abstract]
Net loss	$ (4,236)	$ (4,361)	$ (5,482)
Adjustment [Member]
Assets
Goodwill	(3,370)	(3,370)	(3,370)
Intangible assets, net	3,309	3,218	3,116
Total assets	(61)	(152)	(254)
Stockholders' equity:
Accumulated deficit	(61)	(152)	(254)
Total liabilities and stockholders' equity	(61)	(152)	(254)
Operating expenses:
Amortization of definite-lived intangible assets	61	152	254
Loss before income taxes	(61)	(152)	(254)
Net loss	$ (61)	$ (152)	$ (254)
Basic loss per common share	$ (0.01)	$ (0.01)	$ (0.01)
Diluted loss per common share	$ (0.01)	$ (0.01)	$ (0.01)
Consolidated statement of shareholder's equity [Abstract]
Net loss	$ (61)	$ (152)	$ (254)