Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Cash Flows [Abstract]
Net loss	$ (10,669)	$ (14,365)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	6,271	6,415
Goodwill impairment	10,187	0
Deferred income taxes	(439)	72
Bad debt expense and other reserves	2,225	348
Stock-based compensation	6,177	8,635
Increase in the fair value of contingent consideration liability	75	75
Amortization of lease right-of-use assets	1,516	1,465
Loss from equity method investment	382	0
Write-off and loss on disposal of fixed assets	41	0
Changes in operating assets and liabilities:
Accounts receivable	2,537	9,044
Prepaid expenses	850	384
Other current assets	1,985	(3,493)
Other assets	(71)	263
Accounts payable	(3,698)	(5,578)
Accrued employee expenses	(3,245)	275
Operating lease liabilities	(2,000)	(1,398)
Accrued expenses and other liabilities	(6,530)	5,498
Other liabilities	(44)	(59)
Net cash provided by operating activities	5,550	7,581
Cash flows from investing activities
Purchase of property and equipment	(3,505)	(2,905)
Cash paid for equity method investment	0	(23,174)
Net cash used in investing activities	(3,505)	(26,079)
Cash flows from financing activities
Proceeds from exercise of common stock options	3	2,811
Taxes paid related to net share settlement of equity awards	(727)	(543)
Net cash (used in) provided by financing activities	(724)	2,268
Net increase (decrease) in cash and cash equivalents	1,321	(16,230)
Cash and cash equivalents at beginning of period	181,534	196,128
Cash and cash equivalents at end of period	182,855	179,898
Supplemental disclosures of non-cash activities
Stock-based compensation capitalized for software development	382	473
Capitalized assets included in accounts payable, accrued employee expenses and other accrued expenses	$ 148	$ 176