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Additional Information-Financial Statement Schedule I Condensed Financial Information of Parent Company - STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |  |  |
Net loss | $ (5,320) | $ (69,068) | $ (89,532) |  |
Share-based compensation | 3,362 | 3,813 | 11,436 |  |
Changes in operating assets and liabilities: |  |  |  |  |
Accrued expenses and other payables | 504 | 5,380 | 395 |  |
Prepaid expenses and other current assets | 19 | (12,527) | (22,967) |  |
Net cash used in operating activities | (3,878) | (4,745) | (9,749) |  |
Cash flows from investing activities: |  |  |  |  |
Net cash provided by investing activities |  | 1,223 | 98,982 |  |
Cash flows from financing activities: |  |  |  |  |
Proceeds from borrowings | 1,015 | 18,166 | 71,640 |  |
Repayment of borrowings | (3,238) | (51,214) | (107,500) |  |
Proceeds of advances from related parties | 2,140 | 115,035 | 159,938 |  |
Repayment of advances from related parties |  | (116,821) | (143,447) |  |
Proceeds from convertible loans |  | 21,000 |  |  |
Proceeds from investors | 1,000 |  | 57,767 |  |
Net cash (used in) provided by financing activities | 3,917 | (6,328) | (138,637) |  |
Cash and restricted cash at beginning of year | 3,190 | 13,768 | 64,447 |  |
Effect of exchange rate changes | (67) | (728) | (1,275) |  |
Cash and restricted cash at end of year | 3,162 | 3,190 | 13,768 |  |
Reportable legal entities | Parent |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |
Net loss | (5,302) | (46,116) | (89,215) |  |
Equity in loss of subsidiaries and variable interest entities | 899 | 45,745 | 76,099 |  |
Share-based compensation | 3,362 |  | 11,436 |  |
Changes in operating assets and liabilities: |  |  |  |  |
Amounts due from/to related parties |  | (20,980) | 173 |  |
Accrued expenses and other payables | 2,347 | (292) | 581 |  |
Prepaid expenses and other current assets |  | 123 |  |  |
Net cash used in operating activities | 1,306 | (21,520) | (926) |  |
Cash flows from investing activities: |  |  |  |  |
Repayment of investment in subsidiaries | (2,340) | 1,586 |  |  |
Net cash provided by investing activities | (2,340) | 1,586 |  |  |
Cash flows from financing activities: |  |  |  |  |
Proceeds from borrowings |  |  | 500 |  |
Repayment of borrowings |  |  | (500) |  |
Proceeds of advances from related parties |  |  | 950 |  |
Repayment of advances from related parties |  | (1,050) |  |  |
Proceeds from convertible loans |  | 21,000 |  |  |
Proceeds from warrant liability | 3,000 |  |  |  |
Proceeds from investors | 1,000 |  |  |  |
Net cash (used in) provided by financing activities | 4,000 | 19,950 | 950 |  |
Net increase in cash |  |  | 2,965 | $ 16 | $ 24
Cash and restricted cash at beginning of year | 40 | 24 |  |  |
Effect of exchange rate changes | 0 | 0 | 0 |  |
Cash and restricted cash at end of year | $ 3,005 | $ 40 | $ 24 |  |

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