Notes Payable - General Information (Details)	1 Months Ended			3 Months Ended	12 Months Ended
	Aug. 31, 2019 USD ($)	Apr. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Apr. 15, 2019 $ / shares
Notes Payable
Payments for convertible note hedges	$ 25,200,000		$ 21,100,000
Proceeds from partial termination of convertible note hedges and note hedge warrants	3,200,000
Convertible Note Hedge
Notes Payable
Conversion price (in dollars per share) | $ / shares				$ 16.58			$ 14.51
Shares issuable upon conversion of debt (in shares) | shares				20,249,665
2.25% Convertible Senior Notes due 2022 | Convertible Senior Notes
Notes Payable
Aggregate principal amount of notes issued			335,700,000	$ 120,699,000		$ 120,699,000
Net proceed received			324,000,000.0
Fees and expenses			$ 11,700,000
Stated interest rate (as a percent)			2.25%
Conversion rate, number of shares to be issued per		68.9172	60.3209
Principal amount used for debt instrument conversion ratio		$ 1,000	$ 1,000
Conversion price (in dollars per share) | $ / shares		$ 14.51	$ 16.58
Shares issuable upon conversion of debt (in shares) | shares		23,135,435	20,249,665
Repurchase price, as percentage of principal amount, if company undergoes change of control			100.00%
Percentage of aggregate principal amount payable, in case of event of default			25.00%
Maximum period of the sole remedy for event failures in the Indenture				180 days
Debt redeemed/repurchased	215,000,000.0
Debt redemption/repurchase price	227,300,000
Loss on extinguishment of debt					$ 23,400,000
Equity component of convertible senior notes	$ (27,000,000.0)
Initial debt issuance costs					$ 2,800,000