Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net loss	$ (1,140,000)	$ (570,000)
Adjustments to reconcile net loss to net cash used in operating activities
Depreciation and amortization	38,000	216,000
Amortization of operating lease right-of-use assets	84,000
Share-based compensation expenses	101,000	75,000
Provision for allowances for doubtful accounts	192,000	481,000
Impairment on long-term investments		471,000
Deferred taxes	39,000	(4,000)
Change in fair value of warrant liabilities	350,000	(1,474,000)
Changes in operating assets and liabilities
Accounts receivable	(547,000)	3,413,000
Prepayment and deposit to suppliers	22,000	(1,178,000)
Due from related parties	27,000	3,000
Other current assets	10,000	(47,000)
Accounts payable	(1,833,000)	(2,105,000)
Advances from customers	562,000	(1,668,000)
Accrued payroll and other accruals	114,000	147,000
Other current liabilities	(115,000)	(553,000)
Taxes payable	65,000	(92,000)
Prepaid lease payment	(11,000)
Net cash used in operating activities	(2,270,000)	(3,179,000)
Cash flows from investing activities
Payment for purchase of office equipment		(1,000)
Investment to an ownership investee company	(36,000)
Short-term loan to an unrelated party		(2,000,000)
Collection of short-term loan from an unrelated party		2,672,000
Payment for acquisition of noncontrolling interest		(1,179,000)
Payment for blockchain application platform development costs		(1,200,000)
Purchase of software technology		(448,000)
Net cash used in investing activities	(36,000)	(2,156,000)
Cash flows from financing activities
Proceeds from issuance of common stock and warrant (net of cash offering cost of US$809)		10,263,000
Repayment to investors related to terminated security purchase agreements		(493,000)
Proceeds from short-term bank loan	445,000
Repayment of short-term bank loan	(445,000)
Net cash provided by financing activities		9,770,000
Effect of exchange rate fluctuation on cash and cash equivalents	47,000	116,000
Net /(decrease)/increase in cash, cash equivalents, and restricted cash	(2,259,000)	4,551,000
Cash, cash equivalents, and restricted cash at beginning of the period	3,742,000	2,952,000
Cash, cash equivalents, and restricted cash at end of the period	1,483,000	7,503,000
Supplemental disclosure of cash flow information
Income taxes paid
Interest expense paid	$ 13,000	$ 127,000