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Long-Term Debt - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Apr. 05, 2022 USD ($) day | Feb. 16, 2018 USD ($) day $ / shares Rate | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($)
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |
Interest expense, debt |  |  | $ 3,506,000 | $ 1,930,000 | $ 5,523,000 | $ 3,859,000
Coupon interest expense |  |  | 1,589,000 | 1,617,000 | 3,206,000 | 3,234,000
Amortization of debt discount and debt issuance costs |  |  | 1,917,000 | $ 313,000 | 2,229,000 | 625,000
Additional interest expense |  |  |  |  | 88,000 |
Payments of debt issuance costs |  |  |  |  | $ 4,803,000 | $ 0
Increase in fair value of unseparated embedded conversion feature | $ 5,508,000 |  |  |  |  |
Change in fair value of October 2023 Notes conversion feature | 5,508,000 |  | $ 5,508,000 |  |  |
ADSs, conversion ratio | Rate |  | 9269.56% |  |  |  |
4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 125,000 |  |  |  |
Option to purchase aggregate principal amount, term |  | 30 days |  |  |  |
Option to increase aggregate principal amount |  | $ 18,750,000 |  |  |  |
Proceeds from loans or conditional grants |  | 137,560,000 |  |  |  |
ADS, minimum amount of principal amount for exchange |  | $ 200,000 |  |  |  |
ADS, option price per share (in dollars per share) | $ / shares |  | $ 10.79 |  |  |  |
4.50% Exchangeable Senior Notes Due October 2023 | Convertible Debt |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |
Debt instrument, exchange amount | 117,375,000 |  |  |  |  |
4.50% Exchangeable Senior Notes Due 2023 | Convertible Debt |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |
Debt instrument, face amount | 26,375,000 |  |  |  |  |
4.50 Percent Exchangeable Senior Notes Due October 2023 | Senior Notes |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |
Payments of debt issuance costs | 4,804,000 |  |  |  |  |
4.50 Percent Exchangeable Senior Notes Due October 2023 | Senior Notes | Third Party |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |
Payments of debt issuance costs | $ 5,450,000 |  |  |  |  |
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 One | 4.50% Exchangeable Senior Notes Due October 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] |  |  |  |  |  |
Threshold trading days | day |  | 95 |  |  |  |
Scheduled threshold trading days |  | 35 days |  |  |  |
Debt Instrument, Redemption, Period Two | 4.50% Exchangeable Senior Notes Due October 2023 | Convertible Debt |  |  |  |  |  |
Schedule of Capitalization, Long-term Debt [Line Items] |  |  |  |  |  |
Threshold trading days | day | 95 |  |  |  |  |
Scheduled threshold trading days | 35 days |  |  |  |  |
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% |  |  |  |
Debt Instrument, Redemption, Period Three | 4.50% Exchangeable Senior Notes Due October 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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