Long-Term Debt - Convertible Senior Notes Due 2026 (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Interest expense	$ 23,489,000	$ 30,538,000	$ 31,186,000
Amortization of debt issuance costs	$ 3,179,000	3,177,000	$ 3,600,000
Unamortized debt discount		45,692,000
Convertible Senior Notes Maturing February 2026
Debt Instrument [Line Items]
Interest rate (as a percent)	6.75%
Maturity date	Feb. 15, 2026
Frequency of periodic payment	semi-annually
Initial conversion ratio	0.1433795
Aggregate number of shares | shares	28,675,900
Initial conversion price per share (USD per share) | $ / shares	$ 6.97
Increase in the conversion rate	0.0645207
Redemption price as a percentage of principal amount	100.00%
Unamortized debt discount and debt issuance costs		$ 47,300,000
Unamortized debt issuance costs	$ 5,900,000
Effective interest rate (as a percent)	7.60%	12.40%
Interest expense	$ 14,700,000	$ 7,500,000
Coupon interest expense	13,500,000	5,100,000
Amortization of debt issuance costs	$ 1,200,000
Amortization of debt discount and issuance costs		$ 2,400,000
Convertible Senior Notes Maturing February 2026 | Maximum
Debt Instrument [Line Items]
Percentage of closing price of common stock to conversion price	130.00%
Number of trading days	20
Number of consecutive trading days	30
Convertible Senior Notes Maturing February 2026 | Minimum
Debt Instrument [Line Items]
Percentage of closing price of common stock to conversion price	97.00%
Number of trading days	5
Number of consecutive trading days	10