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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition, General and Administrative Expense and Foreign Currency Risk (Details) $ in Thousands |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Revenue recognition |  |  |  |  |  |  |  |  |  |
Number of criteria to be met prior to recognition of revenue | item | 4 |  |  |  |  |  |  |  |  |
Return period (in days) |  |  |  |  | 14 days | 30 days |  |  |  |
Accrued sales return |  |  |  |  |  |  | $ 381 |  | $ 1,336 | $ 1,236
Cost of goods sold |  |  | $ 146,029 | $ 166,343 | $ 214,261 |  |  |  |  |
Allowance of doubtful accounts |  |  | $ 1,418 | 533 |  |  |  |  |  |
VAT on sales as a percentage on revenue from the sale of products |  | 17.00% |  |  |  |  |  |  |  |
Return period, subsequent to the receipt of shipment with quality-related issues |  |  | 12 months |  |  |  |  |  |  |
Contract Balances |  |  |  |  |  |  |  |  |  |
Advance from customers |  |  |  |  |  |  | 21,731 |  | 17,732 |
Contract liability | $ 5,248 | $ 5,248 | $ 14,330 | 10,246 | 5,248 |  | 14,330 |  | 10,246 | 5,248
Accrued expenses and other current liabilities |  |  |  |  |  |  | 28,642 | $ 22,582 | 22,688 |
Revenue included in advance from customers |  |  |  |  |  |  |  |  |  |
Contract liability as of January 1, 2018 | $ 5,248 |  | 10,246 | 5,248 |  |  |  |  |  |
Cash received in advance, net of VAT |  |  | 240,460 | 199,899 |  |  |  |  |  |
Revenue recognized from opening balance of contract liability |  |  | (10,246) | (5,248) |  |  |  |  |  |
Revenue recognized from contract liability arising during current year |  |  | (226,130) | (189,653) |  |  |  |  |  |
Contract liability as of December 31, 2018 |  | $ 5,248 | $ 14,330 | 10,246 | 5,248 |  |  |  |  |
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] |  |  | true |  |  |  |  |  |  |
Selling and marketing |  |  |  |  |  |  |  |  |  |
Advertising expense |  |  | $ 41,975 | 43,308 | 62,767 |  |  |  |  |
General and administrative |  |  |  |  |  |  |  |  |  |
Research and development expense |  |  | 17,871 | 5,694 | 5,207 |  |  |  |  |
Chargeback incurred |  |  | 1,836 | 2,938 | 2,929 |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  |
Income tax due to uncertain tax positions |  |  |  |  |  |  | 0 |  | 0 | $ 0
Accrued expenses and other current liabilities |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |
Accrued sales return |  |  |  |  |  |  | 381 |  | 1,336 |
Product sales |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  | 144,061 | 156,326 | 189,816 |  |  |  |  |
Shipping and handling |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  | $ 36,691 | $ 51,731 | $ 60,131 |  |  |  |  |
Foreign currency risk | Denominated in RMB |  |  |  |  |  |  |  |  |  |
Foreign currency risk |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents, term deposit and restricted cash |  |  |  |  |  |  | $ 3,952 |  | $ 4,368 |
Maximum |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |
Return period, subsequent to the receipt of shipment with no quality-related issues |  |  | 7 days | 14 days |  |  |  |  |  |
Return period, subsequent to the receipt of shipment with quality-related issues |  |  | 30 days |  |  |  |  |  |  |

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