CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (18,654)	$ (21,915)	$ (34,864)	$ (11,545)	$ (40,569)	$ (46,409)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,200		3,600		2,335	7,701
Amortization of right-of-use assets under operating leases	2,600		2,800		4,513	5,474
Amortization of intangible assets	2,911		2,840		5,510	7,049
Unrealized loss on investment in equity securities					0	12,571
Share-based compensation expense	600		1,900		2,079	4,824
Bad debt expense					615	1,066	$ 2,229
Amortization of debt discount					334	333
Amortization of debt issuance costs					396	366
Deferred income taxes					65	261
Loss on disposal of fixed assets					8	99
Changes in operating assets and liabilities:
Accounts receivable					4,042	7,212
Prepaid expenses and other current assets					405	1,057
Other assets					851	868
Accounts payable and accrued expenses					2,962	(6,734)
Current and non-current operating lease liabilities					(4,855)	(6,024)
Other current and non-current liabilities					(1,466)	(930)
Net cash used in operating activities					(22,775)	(11,216)
Cash flows from investing activities:
Additions to premises and equipment					(693)	(1,466)
Proceeds from the sale of business					3,000	0
Net cash provided by (used in) investing activities					2,307	(1,466)
Cash flows from financing activities:
Proceeds from convertible debt payable to related parties (Note 1)					1,200	0
Distributions to non-controlling interests					(1,751)	(491)
Payments of tax withholding on issuance of restricted share units and restricted shares					(927)	(1,417)
Net cash used in financing activities					(1,478)	(1,908)
Net decrease in cash, cash equivalents and restricted cash					(21,946)	(14,590)
Cash, cash equivalents and restricted cash at the beginning of the period		$ 62,096		$ 86,583	62,096	86,583	86,583
Cash, cash equivalents and restricted cash at the end of the period	$ 40,150		$ 71,993		40,150	71,993	$ 62,096
Supplemental cash flow information:
Interest paid					6,214	8,463
Income taxes paid (received), net					1,515	(944)
Acquisition of right-of-use assets with operating lease liabilities					2,327	958
Reduction of right-of-use assets from operating lease modifications or reassessments					(3,740)	(1,715)
Non-cash investing and financing activities:
Net (decrease) increase in payables for purchases of premises and equipment					$ (48)	$ 469