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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 20 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Cash flows from operating activities              
Net loss $ (391) $ (2,973) $ (1,522) $ (10,124) $ (1,913) $ (12,963)  
Adjustments to reconcile net loss to net cash used in operating activities              
Depreciation and amortization         66 508  
Amortization of operating lease right-of-use assets         88  
Share-based compensation expenses         307 215  
Provision for allowances for doubtful accounts         445 1,521  
Impairment on intangible assets 1,502     3,380  
Impairment on goodwill     5,289  
Impairment on long-term investments     460  
Deferred taxes         (10) 805  
Change in fair value of warrant liabilities 120 (501)     (351) (1,449)  
Changes in operating assets and liabilities              
Accounts receivable         (289) (1,465)  
Prepayment and deposit to suppliers         (5,191) 1,016  
Due from related parties         226 22  
Other current assets         11 (205)  
Accounts payable         (1,946) 1,095  
Accrued payroll and other accruals         242 150  
Lease payment liability related to short-term leases         180  
Other current liabilities         291 (292)  
Taxes payable         123 (57)  
Prepaid lease payment         (10)  
Net cash used in operating activities         (4,055) (3,693)  
Cash flows from investing activities              
Payment for purchase of office equipment         (11)  
(Investment to)/withdraw investment from an investee         (36) 460  
Short-term loan to unrelated parties         (2,108)  
Collection of short-term loan from unrelated parties         4,716  
Payment for acquisition of noncontrolling interest         (1,687)  
Payment for blockchain application platform development costs         (3,743) $ (3,710)
Prepayment for software system development         (760)  
Purchase of software technology         (437)  
Net cash used in investing activities         (796) (2,810)  
Cash flows from financing activities              
Proceeds from issuance of common stock and warrant (net of cash offering cost of US$8 and US$809, respectively)         2,393 10,263  
Repayment to investors related to terminated security purchase agreements         (933)  
Proceeds from short-term bank loan         438 920  
Repayment of short-term bank loan         (875) (460)  
Net cash provided by financing activities         1,956 9,790  
Effect of exchange rate fluctuation on cash, cash equivalents and restricted cash         (10) (320)  
Net (decrease)/increase in cash, cash equivalents, and restricted cash         (2,905) 2,967  
Cash, cash equivalents, and restricted cash at beginning of the period     $ 3,742 $ 2,952 3,742 2,952  
Cash, cash equivalents, and restricted cash at end of the period $ 837 $ 5,919     837 5,919 $ 837
Supplemental disclosure of cash flow information              
Income taxes paid          
Interest expense paid         36 146  
Non-cash transaction disclosure              
Payable for acquisition of noncontrolling interest         218  
Unrelated Parties [Member]              
Changes in operating assets and liabilities              
Advance from customers         4,151 (1,423)  
Related Parties [Member]              
Changes in operating assets and liabilities              
Advance from customers         $ 9