CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ (9,993)	$ (26,422)	$ (10,731)	$ (39,044)
Adjustments to reconcile net loss to net cash used in operating activities
Share-based compensation expense			4,047	5,596
Depreciation and amortization	1,635	481	2,763	957
Non-cash interest expense			991	12,058
Allowance for doubtful accounts			340	0
Litigation settlement	0	0	5,000	0
Income tax benefit			(12,222)	0
Conversion expense			0	2,266
Loss on disposal of subsidiaries, net	1,234	0	1,446	0
Equity in losses of equity method investees	358	12	417	15
Gain on extinguishment of liability			(777)	0
Gain on remeasurement of investment	(2,915)	0	(2,915)	0
Impairment losses			0	7,088
Settlement of ROU operating lease liabilities			0	(802)
Change in fair value of contingent consideration, net	(2,402)	746	(1,907)	1,279
Change in assets and liabilities (net of amounts acquired):
Accounts receivable			5,503	1,162
Inventory			379	0
Prepaid expenses and other assets			(7,711)	825
Accounts payable			(60)	(1,067)
Deferred revenue			(1,497)	117
Amount due to related parties			770	1,079
Accrued expenses, salary and other current liabilities			5,794	(1,919)
Net cash used in operating activities			(10,370)	(10,390)
Cash flows from investing activities:
Acquisition of property and equipment			(603)	(41)
Disposal of subsidiaries, net of cash disposed			(44)	0
Acquisition of subsidiaries, net of cash acquired			(100,579)	0
Investments in long-term investment			(26,083)	0
Notes receivable			0	(1,838)
Investment in debt securities			(15,528)	0
Net cash used in investing activities			(142,837)	(1,879)
Cash flows from financing activities
Proceeds from issuance of convertible notes			220,000	2,000
Proceeds from exercise of options and warrants and issuance of common stock			163,046	39,128
Proceeds from noncontrolling interest shareholder			0	7,148
Borrowings from Small Business Association Paycheck Protection Program			0	460
Repayment of amounts due to related parties			0	(2,999)
Net cash provided by financing activities			383,046	45,737
Effect of exchange rate changes on cash			39	283
Net increase in cash and cash equivalents			229,878	33,751
Cash and cash equivalents at the beginning of the period			165,764	2,633	$ 2,633
Cash and cash equivalents at the end of the period	$ 395,642	$ 36,384	395,642	36,384	$ 165,764
Supplemental disclosure of cash flow information:
Cash paid for income tax			801	0
Cash paid for interest			0	311
Issuance of shares for acquisition of DBOT			0	7,042
Tree Technologies measurement period adjustment			0	12,848
Issuance of shares for acquisition			53,504	0
Issuance of shares for convertible notes conversion			$ 140,126	$ 20,069