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v3.20.4

Long-Term Debt - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 16, 2018 USD ($) day $ / shares Rate | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |
Proceeds from loans or conditional grants |  | $ 0 | $ 0 | $ 143,750
ADSs, conversion ratio | Rate | 9269.56% |  |  |
4.50% Exchangeable Senior Notes Due 2023 |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |
Interest rate |  | 4.50% |  |
4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |
Debt instrument, face amount | $ 125,000 |  |  |
Interest rate | 4.50% |  |  |
Option to increase aggregate principal amount | $ 18,750 |  |  |
Proceeds from loans or conditional grants | $ 137,560 |  |  |
ADS, option price per share (in dollars per share) | $ / shares | $ 10.79 |  |  |
ADS premium percentage | 20.00% |  |  |
ADS purchased, price per share (in dollars per share) | $ / shares | $ 8.99 |  |  |
Debt Instrument, Redemption, Period One | 4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |
Number of business days | 5 days |  |  |
Consecutive business days | 5 days |  |  |
Percentage of product of the last reported sale price of the American Depositary Shares and the exchange rate on each such trading day | 98.00% |  |  |
Debt Instrument, Redemption, Period Two | 4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |
Scheduled threshold trading days | 95 days |  |  |
Threshold trading days | day | 35 |  |  |
Debt Instrument, Redemption, Period Three | 4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |
Threshold trading days | day | 20 |  |  |
Consecutive trading days | day | 30 |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |

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