Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Statement of Cash Flows [Abstract]
Net loss	$ (21,911,000)	$ (38,425,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	12,696,000	13,182,000
Goodwill impairment	10,187,000	0
Deferred income taxes	(397,000)	127,000
Bad debt expense and other reserves	3,485,000	485,000
Stock-based compensation	12,631,000	24,191,000
Increase in the fair value of contingent consideration liability	121,000	150,000
Amortization of lease right-of-use assets	3,002,000	2,944,000
Loss from equity method investment	889,000	273,000
Write-off and loss on disposal of fixed assets	41,000	1,139,000
Changes in operating assets and liabilities:
Accounts receivable	(137,000)	(2,011,000)
Prepaid expenses	(1,096,000)	(2,538,000)
Other current assets	304,000	(29,711,000)
Other assets	53,000	1,406,000
Accounts payable	(11,280,000)	(5,777,000)
Accrued employee expenses	4,410,000	5,905,000
Operating lease liabilities	(3,705,000)	(3,064,000)
Accrued expenses and other liabilities	(8,509,000)	39,047,000
Other liabilities	905,000	(99,000)
Net cash provided by operating activities	1,689,000	7,224,000
Cash flows from investing activities
Purchase of property and equipment	(6,294,000)	(5,405,000)
Cash paid for equity method investment	0	(23,174,000)
Net cash used in investing activities	(6,294,000)	(28,579,000)
Cash flows from financing activities
Payment of contingent consideration liability	(2,263,000)	0
Proceeds from exercise of common stock options	3,000	2,835,000
Taxes paid related to net share settlement of equity awards	(1,583,000)	(1,043,000)
Net cash (used in) provided by financing activities	(3,843,000)	1,792,000
Net decrease in cash and cash equivalents	(8,448,000)	(19,563,000)
Cash and cash equivalents at beginning of period	181,534,000	196,128,000
Cash and cash equivalents at end of period	173,086,000	176,565,000
Supplemental disclosures of non-cash activities
Stock-based compensation capitalized for software development	783,000	978,000
Capitalized assets included in accounts payable, accrued employee expenses and other accrued expenses	410,000	245,000
Capitalized asset retirement costs included in property and equipment	$ 498,000	$ 0