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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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