Revision of Previously Issued Financial Statements - Consolidated Statements of Operations (Details) - USD ($) $ 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
Pro forma Income Statement:
Total revenue	$ 52,928	$ 51,439	$ 54,954	$ 56,370	$ 70,531	$ 79,691	$ 56,167	$ 47,095	$ 215,691	$ 253,484	$ 211,336
Gross profit	39,262	35,961	36,729	40,300	49,157	53,022	38,287	31,056	152,252	171,522	146,523
Operating income	(2,041)	(2,355)	(1,687)	825	5,422	17,085	(2,278)	(6,040)	(5,258)	14,189	(920)
Income before taxes									(3,420)	14,409	2,609
Provision for income taxes									2,035	6,545	(435)
Net income	$ (1,756)	$ (1,678)	$ (2,023)	$ 4	4,585	$ 11,847	$ (2,511)	$ (6,056)	(5,455)	7,864	3,044
Product and license
Pro forma Income Statement:
Total revenue									132,986	183,313	152,054
Services and other
Pro forma Income Statement:
Total revenue									$ 82,705	70,171	59,282
As Previously Reported
Pro forma Income Statement:
Total revenue										254,570	212,280
Gross profit										172,608	147,467
Operating income										15,275	24
Income before taxes										15,495	3,553
Provision for income taxes										6,706	(293)
Net income										8,789	3,846
As Previously Reported | Product and license
Pro forma Income Statement:
Total revenue										184,173	152,977
As Previously Reported | Services and other
Pro forma Income Statement:
Total revenue										70,397	59,303
Adjustment
Pro forma Income Statement:
Total revenue					500					(1,086)	(944)
Gross profit					500					(1,086)	(944)
Operating income										(1,086)	(944)
Income before taxes										(1,086)	(944)
Provision for income taxes										(161)	(142)
Net income					$ 500					(925)	(802)
Adjustment | Product and license
Pro forma Income Statement:
Total revenue										(860)	(923)
Adjustment | Services and other
Pro forma Income Statement:
Total revenue										$ (226)	$ (21)