Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Cash Flows [Abstract]
Net loss	$ (8,418)	$ (10,669)
Loss from discontinued operations, net of taxes	0	(279)
Net loss from continuing operations	(8,418)	(10,390)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	4,312	5,029
Goodwill impairment	0	8,264
Deferred income taxes	17	(439)
Bad debt expense and other reserves	232	2,225
Stock-based compensation	6,385	5,914
Increase in the fair value of contingent consideration liability	31	75
Amortization of lease right-of-use assets	1,068	1,516
Loss from equity method investment	329	382
Write-off and loss on disposal of fixed assets	0	41
Other noncash expense	125	0
Changes in operating assets and liabilities:
Accounts receivable	4,383	2,131
Prepaid expenses and other assets	2,205	2,851
Accounts payable	717	(3,697)
Accrued employee expenses	(1,745)	(3,245)
Operating lease liabilities	(1,253)	(2,000)
Accrued expenses and other liabilities	(2,607)	(6,726)
Other liabilities	(302)	(44)
Net cash provided by operating activities - continuing operations	5,479	1,887
Net cash provided by operating activities - discontinued operations	0	3,663
Net cash provided by operating activities	5,479	5,550
Cash flows from investing activities
Purchase of property and equipment	(2,816)	(3,154)
Net cash used in investing activities - continuing operations	(2,816)	(3,154)
Net cash provided by (used in) investing activities - discontinued operations	7,500	(351)
Net cash provided by (used in) investing activities	4,684	(3,505)
Cash flows from financing activities
Proceeds from exercise of common stock options	567	3
Taxes paid related to net share settlement of equity awards	(1,642)	(727)
Payments for the repurchase of common stock	(7,829)	0
Net cash used in financing activities	(8,904)	(724)
Net increase in cash and cash equivalents	1,259	1,321
Cash and cash equivalents at beginning of period	273,314	181,534
Cash and cash equivalents at end of period	274,573	182,855
Supplemental disclosures of non-cash activities
Stock-based compensation capitalized for software development	347	345
Capitalized assets included in accounts payable, accrued employee expenses and other accrued expenses	$ 585	$ 148