Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net loss	$ (2,688)	$ (5,221)
Adjustments to reconcile net loss to net cash (used in)/provided by operating activities
Depreciation and amortization	632	856
Amortization of operating lease right-of-use assets	207	13
Share-based compensation expenses	7,028	2,152
Loss on disposal of long-term investment	38	0
Provision of allowances for doubtful accounts	0	833
Change in fair value of warrant liabilities	(11,329)	(653)
Deferred taxes	177	143
Other non-operating losses	524	11
Changes in operating assets and liabilities
Accounts receivable	(986)	116
Prepayment and deposit to suppliers	(2,061)	2,804
Due from related parties	0	24
Other current assets	6	(6)
Long-term deposits and prepayments	(74)	0
Accounts payable	495	180
Advances from customers	(221)	(671)
Accrued payroll and other accruals	90	16
Other current liabilities	(355)	(299)
Taxes payable	29	14
Operating lease liabilities	(116)	(8)
Lease payment liability related to short-term leases	(54)	54
Net cash (used in)/provided by operating activities	(8,838)	326
Cash flows from investing activities
Payment for leasehold improvements and purchase of vehicles, furniture and office equipment	(334)	0
Cash effect of deconsolidation of VIE’s subsidiaries	(8)	0
Proceeds from disposal of fixed assets	0	3
Investment and advances to ownership investee entities	(2,263)	(28)
Short-term loan to unrelated parties	(202)	(1,444)
Deposit and prepayment paid for contracts of other investing activities	(1,500)	0
Payment for blockchain platform applications development costs	0	(503)
Payment for purchase of software technology and other intangible assets	(1,160)	(1,500)
Net cash used in investing activities	(5,467)	(3,472)
Cash flows from financing activities
Proceeds from issuance of common stock and warrants (net of cash offering cost of $1,600 and $750 respectively)	17,111	6,250
Repayment of short-term bank loan	0	(435)
Net cash provided by financing activities	17,111	5,815
Effect of exchange rate fluctuation on cash and cash equivalents	70	25
Net increase in cash and cash equivalents	2,876	2,694
Cash and cash equivalents, at beginning of the year	4,297	1,603
Cash and cash equivalents, at end of the year	7,173	4,297
Supplemental disclosure of cash flow information
Income taxes paid	0	0
Interest expense paid	$ 0	$ 2