CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities:
Net loss	$ (47,918,000)	$ (338,996,000)	$ (159,268,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Amortization of intangible assets	27,219,000	30,076,000	32,864,000
Depreciation	14,064,000	12,778,000	17,259,000
Stock-based compensation expense	10,073,000	16,558,000	37,619,000
Non-cash interest expense on senior secured convertible notes (related party)	9,180,000	17,374,000	0
Accretion of debt discount	7,571,000	6,242,000	4,812,000
Non-cash operating lease expense	5,555,000	5,369,000	0
Impairment of right-of-use and long-lived assets	4,671,000	0	0
Provision for bad debts	1,693,000	727,000	966,000
Amortization expense of finance leases	1,652,000	2,413,000	0
Amortization of deferred financing costs	1,560,000	1,078,000	955,000
Change in fair value of interest make-whole derivative	871,000	0	0
Deferred tax provision (benefit)	10,000	(3,727,000)	2,019,000
Change in fair value of financing derivatives	(10,287,000)	(5,100,000)	14,226,000
Change in fair value of warrant liability	(4,894,000)	2,411,000	0
Impairment of goodwill	0	224,272,000	0
Impairment of intangible asset	0	17,308,000	0
Change in fair value of investment in equity securities	0	2,324,000	(1,443,000)
Other	37,000	(2,000)	568,000
Changes in operating assets and liabilities:
Accounts receivable	2,024,000	2,738,000	4,707,000
Prepaid expenses and other assets	(6,283,000)	2,198,000	(2,891,000)
Accounts payable, accrued expenses, and other liabilities	(17,095,000)	10,438,000	(4,955,000)
Contract liability and customer advances	7,341,000	(3,477,000)	(30,013,000)
Current operating lease liability	(6,327,000)	(7,638,000)	0
Insurance recoverable on litigation settlements	0	0	10,000,000
Net cash provided by (used in) operating activities	717,000	(4,636,000)	(72,575,000)
Investing activities:
Capitalized internal-use software costs	(15,078,000)	(11,500,000)	(9,608,000)
Purchases of property and equipment	(477,000)	(2,736,000)	(4,206,000)
Proceeds from sale of investment in equity securities	0	3,776,000	0
Net cash used in investing activities	(15,555,000)	(10,460,000)	(13,814,000)
Financing activities:
Principal payments on finance leases	(1,754,000)	(2,535,000)	0
Principal payments on capital lease and software license arrangements	(367,000)	(2,070,000)	(9,006,000)
Payments for taxes related to net share settlement of equity awards	(117,000)	(1,267,000)	(5,263,000)
Proceeds from the exercise of stock options	142,000	1,191,000	2,855,000
Proceeds from private placement, net of issuance costs paid	0	19,752,000	0
Proceeds from secured term note	0	13,000,000	0
Secured term note issuance costs	0	(350,000)	0
Proceeds from sale-leaseback financing transaction	0	4,252,000	0
Proceeds from borrowings on senior secured convertible notes (related party)	0	0	100,000,000
Senior secured convertible notes issuance costs	0	0	(5,146,000)
Financing proceeds received on subscription receivable (related party)	0	0	9,679,000
Net cash (used in) provided by financing activities	(2,096,000)	31,973,000	93,119,000
Effect of exchange rate changes on cash, cash equivalents and restricted cash	902,000	(302,000)	(1,657,000)
Net (decrease) increase in cash, cash equivalents and restricted cash	(16,032,000)	16,575,000	5,073,000
Cash, cash equivalents and restricted cash at beginning of period	66,773,000	50,198,000	45,125,000
Cash, cash equivalents and restricted cash at end of period	50,741,000	66,773,000	50,198,000
Total cash, cash equivalents and restricted cash	66,773,000	50,198,000	50,198,000
Supplemental cash flow disclosures:
Interest paid ($21,420, $3,046 and $7,484 of interest paid in 2020, 2019, and 2018 attributable to related party, respectively)	23,792,000	4,081,000	8,136,000
Income taxes paid, net of refunds	1,182,000	1,191,000	1,260,000
Supplemental non-cash activities:
Settlement of restricted stock unit liability	3,065,000	4,611,000	15,818,000
Assets acquired through finance leases and software obligations	1,109,000	4,277,000	1,737,000
Capital Expenditures Incurred but Not yet Paid	395,000	456,000	1,149,000
Leasehold improvements acquired through lease incentives	394,000	2,050,000	0
Fair value of warrants issued in private placement	0	10,798,000	0
Repurchase of Common Stock in exchange for senior secured convertible notes	0	0	94,021,000
Shares issued in connection with settlement of litigation	0	0	90,768,000
Insurance recovery on litigation settlement	0	0	27,232,000
Fair value of financing derivatives issued with senior secured convertible notes	0	0	17,574,000
Common Stock warrants issued with senior secured convertible notes	0	0	5,733,000
Notes Option derivative liability settlement	0	0	5,700,000
Modification of debt in consideration for the reduction of the senior secured convertible note minimum cash balance requirement	$ 0	$ 0	$ 4,000,000