Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net (loss) income	$ (38,329)	$ 76,544	$ (54,890)
Income from discontinued operations, net of taxes	40	96,383	3,445
Loss from continuing operations	(38,369)	(19,839)	(58,335)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	16,279	20,372	20,695
Goodwill impairment	0	8,264	0
Deferred income taxes	63	(743)	215
Bad debt expense and other reserves	528	2,984	1,432
Stock-based compensation	20,395	23,077	36,462
Additions and changes in fair value	41	182	300
Amortization of lease right-of-use assets	4,295	5,408	5,946
Loss from equity method investment	5,404	1,989	1,280
Impairment of right-of-use assets and write-off and net loss on disposal of finite-lived assets	1,682	2,436	1,109
Other noncash expenses	408	0	0
Changes in operating assets and liabilities:
Accounts receivable	15,685	2,332	3,989
Prepaid expenses and other assets	2,733	1,297	(103)
Accounts payable	(1,806)	(8,221)	(4,922)
Accrued employee expenses	(1,754)	357	1,494
Operating lease liabilities	(5,192)	(6,257)	(6,846)
Accrued expenses and other current liabilities	(5,630)	(4,128)	10,504
Other liabilities	(388)	388	(397)
Net cash provided by operating activities - continuing operations	14,374	29,898	12,823
Net cash (used in) provided by operating activities - discontinued operations	(180)	9,219	7,521
Net cash provided by operating activities	14,194	39,117	20,344
Cash flows from investing activities
Purchase of property and equipment	(10,689)	(10,277)	(10,181)
Cash paid for equity method investment	0	0	(23,174)
Net cash used in investing activities - continuing operations	(10,689)	(10,277)	(33,355)
Net cash provided by (used in) investing activities - discontinued operations	6,484	112,178	(1,103)
Net cash (used in) provided by investing activities	(4,205)	101,901	(34,458)
Cash flows from financing activities
Payment of contingent consideration liability	(2,214)	(2,263)	0
Proceeds from exercise of common stock options	1,391	97	2,859
Taxes paid related to net share settlement of equity awards	(5,320)	(4,251)	(3,339)
Payments for the repurchase of common stock	(31,943)	(42,821)	0
Net cash used in financing activities	(38,086)	(49,238)	(480)
Net (decrease) increase in cash and cash equivalents	(28,097)	91,780	(14,594)
Cash and cash equivalents at beginning of year	273,314	181,534	196,128
Cash and cash equivalents at end of year	245,217	273,314	181,534
Supplemental disclosure of cash flow information
Income taxes	1,554	43	26
Supplemental disclosures of non-cash activities
Stock-based compensation capitalized for software development	1,296	1,322	1,670
Capitalized assets included in accounts payable, accrued employee expenses and other accrued expenses	1,239	643	363
Capitalized asset retirement costs included in property and equipment	$ 0	$ 498	$ 0