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Purchases of capped calls In connection with convertible senior notes.

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Debt - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands			1 Months Ended		3 Months Ended		12 Months Ended
	Aug. 07, 2017 USD ($) $ / shares	Jul. 31, 2014 $ / shares $ / Item	Jul. 31, 2014 $ / shares $ / Item	Jan. 31, 2013 USD ($) $ / shares $ / Item shares	Mar. 31, 2022 USD ($) $ / shares $ / Item	Mar. 31, 2021 USD ($) $ / shares	Dec. 31, 2021 USD ($)	Mar. 07, 2022 USD ($)	Jan. 01, 2022	Aug. 01, 2017 $ / shares	Dec. 31, 2016 USD ($)
Debt
Net increase (decrease) in cash and cash equivalents					$ 15,277	$ 36,403
Liability component
Principal					549,707		$ 433,484
Debt discount and issuance costs, net					$ (10,960)		(38,831)
2025 Notes
Debt
Debt discount							67,300
Common stock price to current conversion price ratio					130.00%
Average trading price percentage					98.00%
Total issuance costs							5,400
Liability issuance costs							3,500
Equity issuance costs							$ 1,900
Effective interest rate							8.87%
2025 Notes \| ASU 2020-06
Debt
Effective interest rate									2.88%
2025 Notes \| Common stock
Debt
Share Price \| $ / shares										$ 13.28
Convertible senior notes \| 2025 Notes
Debt
Ratio of repurchase price to the principal amount					100.00%
Liability component
Principal					$ 192,500		$ 192,500
Debt discount and issuance costs, net					(2,437)		(38,211)
Net Carrying Amount					190,063		154,289
Equity component, net					0		65,361
Interest expense
Contractual interest expense					1,203	1,203
Amortization of debt issuance costs					171	159
Amortization of debt discount					0	1,911
Total interest and amortization expense					$ 1,374	$ 3,273
Convertible senior notes \| 2025 Notes \| Over-Allotment Option
Debt
Loan amount	$ 17,500
Convertible senior notes \| 2025 Notes \| Private Placement
Debt
Loan amount	$ 192,500
Debt Instrument, annual interest rate	2.50%
Convertible senior notes \| 2025 Notes \| Common stock
Debt
Conversion rate for shares of common stock per $1,000 principal	57.9240
Conversion price (dollars per share) \| $ / shares	$ 17.26				$ 17.26	$ 17.26
Conversion premium (as a percent)	30.00%
Convertible senior notes \| 2028 Notes
Debt
Loan amount					$ 261,000
Debt instrument maturity date					Mar. 15, 2028
Proceeds from issuance of convertible notes, net of issuance costs					$ 252,600
Common stock price to current conversion price ratio					130.00%
Average trading price percentage					98.00%
Ratio of repurchase price to the principal amount					100.00%
Portion of debt instrument face amount, Exercised					$ 36,000
Effective interest rate					2.69%
Liability component
Principal					$ 261,000
Debt discount and issuance costs, net					(8,332)
Net Carrying Amount					252,668
Interest expense
Contractual interest expense					346
Amortization of debt issuance costs					84
Total interest and amortization expense					$ 430
Convertible senior notes \| 2028 Notes \| Privately-negotiated capped call option
Debt
Cap price for the underlying number of shares (in dollars per share) \| $ / Item					33.9850
Purchases of capped calls in connection with convertible senior notes due 2028					$ 21,000
Convertible senior notes \| 2028 Notes \| Over-Allotment Option
Debt
Loan amount					$ 45,000
Convertible senior notes \| 2028 Notes \| Private Placement
Debt
Debt Instrument, annual interest rate					2.125%
Convertible senior notes \| 2028 Notes \| Common stock
Debt
Conversion rate for shares of common stock per $1,000 principal					38.1432
Conversion price (dollars per share) \| $ / shares					$ 26.22
Convertible subordinated notes \| Privately-negotiated capped call option
Debt
Cap price for the underlying number of shares (in dollars per share) \| $ / Item		27.04	27.04
Convertible subordinated notes \| 2023 Notes
Debt
Loan amount				$ 287,500
Debt Instrument, annual interest rate				2.125%
Conversion price (dollars per share) \| $ / shares		$ 19.77	$ 19.77	$ 27.79
Ratio of repurchase price to the principal amount					100.00%
Effective interest rate								2.37%
Proceeds from issuance of notes payable, net of debt issuance costs				$ 281,200
Debt Instrument, Repurchased Face Amount					$ 144,800			$ 144,800			$ 14,100
Liability component
Principal					96,207		240,984	96,200
Debt discount and issuance costs, net					191		620	$ (200)
Net Carrying Amount							$ 240,364
Interest expense
Contractual interest expense					1,084	$ 1,280
Amortization of debt issuance costs					122	141
Total interest and amortization expense					$ 1,206	$ 1,421
Convertible subordinated notes \| 2023 Notes \| Privately-negotiated capped call option
Debt
Strike price for the underlying number of shares (in dollars per share) \| $ / shares		$ 27.79	$ 19.77	$ 27.79
Cap price for the underlying number of shares (in dollars per share) \| $ / Item		38.00	38.00	38.00
Convertible subordinated notes \| 2023 Notes \| Stock prices below $26.22 per share \| Minimum
Debt
Net shares settlement payable to the entity \| shares				0