Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net loss	$ (5,221)	$ (1,270)
Adjustments to reconcile net loss to net cash provided by/(used in) operating activities
Depreciation and amortization	856	170
Amortization of operating lease right-of-use assets	13	90
Loss on disposal of fixed assets	11
Share-based compensation expenses	2,152	393
Provision of allowances for doubtful accounts	833	2,335
Change in fair value of warrant liabilities	(653)	(499)
Deferred taxes	143	(168)
Changes in operating assets and liabilities
Accounts receivable	116	699
Prepayment and deposit to suppliers	2,804	(5,221)
Due from related parties	24	145
Other current assets	(6)	7
Accounts payable	180	(2,441)
Advances from customers	(671)	973
Accrued payroll and other accruals	16	27
Other current liabilities	(299)	110
Taxes payable	14	265
Prepaid lease payment	(9)	(10)
Operating lease liabilities	1
Lease payment liability related to short-term leases	54	138
Net cash provided by/(used in) operating activities	326	(4,311)
Cash flows from investing activities
Proceeds from disposal of fixed assets	3
Investment to investee entities	(28)	(36)
Short-term loan to unrelated parties	(1,444)
Payment for blockchain platform applications development costs	(503)	(160)
Payment for purchase of software technology and other intangible assets	(1,500)	(1,962)
Net cash used in investing activities	(3,472)	(2,158)
Cash flows from financing activities
Proceeds from issuance of common stock and warrants (net of cash offering cost of $750 and $15, respectively)	6,250	4,787
Proceeds from short-term bank loan		435
Repayment of short-term bank loan	(435)	(870)
Net cash provided by financing activities	5,815	4,352
Effect of exchange rate fluctuation on cash and cash equivalents	25	(22)
Net increase/(decrease) in cash and cash equivalents	2,694	(2,139)
Cash and cash equivalents at beginning of the year	1,603	3,742
Cash and cash equivalents at end of the year	4,297	1,603
Supplemental disclosure of cash flow information
Income taxes paid
Interest expense paid	$ 2	$ 42