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Unaudited Interim Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2019 and 2020 - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Operating activities:    
Net loss $ (16,662) $ (7,827)
Adjustments to reconcile net loss to net cash from operating activities:    
Share-based compensation 3,470 371
Depreciation expenses 15 23
Changes in operating assets and liabilities:    
Advances to suppliers 135 143
Due from related parties 100
Prepaid expenses and other current assets (42) 123
Operating lease right-of-use assets (69) 134
Other noncurrent assets 5 (60)
Accounts payable 2,603 (620)
Accrued expenses (1,164) 2,377
Operating lease liabilities 63 (56)
Other current liabilities 596 232
Net cash used in operating activities (11,050) (5,060)
Investing activities:    
Acquisitions of property and equipment (9) (4)
Net cash used in investing activities (9) (4)
Financing activities:    
Proceeds from loans 2,986
Loans from related parties 14 350
Net cash provided by financing activities 14 3,336
Effect of foreign exchange rate changes, net 29 (200)
Net decrease in cash and cash equivalents (11,016) (1,928)
Cash at beginning of period 35,933 3,889
Cash at end of period $ 24,917 $ 1,961