The value of common stock price as a percentage of conversion price.

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Portion of debt instrument face amount, exercised.

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Purchases of capped calls In connection with convertible senior notes.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Debt - Convertible Senior Notes (Details) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Aug. 07, 2017 USD ($) $ / shares	Jan. 31, 2013 USD ($) $ / shares $ / Item	Sep. 30, 2022 USD ($) $ / shares	Mar. 31, 2022 USD ($) $ / shares $ / Item	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Apr. 18, 2022 USD ($)	Mar. 07, 2022 USD ($)	Jan. 01, 2022	Aug. 01, 2017 $ / shares	Dec. 31, 2016 USD ($)	Jul. 31, 2014 $ / Item
Debt
Principal			$ 549,704			$ 549,704		$ 433,484
Debt discount and issuance costs, net			(9,894)			$ (9,894)		(38,831)
2023 Notes \| Privately-negotiated capped call option
Debt
Cap price for the underlying number of shares (in dollars per share) \| $ / Item														27.04
2025 Notes
Debt
Unamortized 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
2028 Notes
Debt
Debt instrument, covenant terms description						The indenture governing the 2028 Notes contains customary terms and covenants, including a merger covenant and that upon certain events of default occurring and continuing, either the Trustee or the holders of at least 25% of the aggregate principal amount of the outstanding Notes may declare 100% of the principal of, and accrued and unpaid interest, if any, on, all the Notes to be due and payable immediately.
Convertible senior notes \| 2025 Notes
Debt
Ratio of repurchase price to the principal amount						100.00%
Principal			192,500			$ 192,500		$ 192,500
Debt discount and issuance costs, net			(2,092)			(2,092)		(38,211)
Net Carrying Amount			190,408			190,408		154,289
Equity component, net			0			0		65,361
Interest expense
Contractual interest expense			1,203		$ 1,203	3,609	$ 3,609
Amortization of debt issuance costs			174		166	517	487
Amortization of debt discount			0		1,997	0	5,859
Total interest and amortization expense			$ 1,377		3,366	$ 4,126	9,955
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
Debt instrument maturity date	Aug. 15, 2025
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%
Effective interest rate			2.70%			2.70%
Principal			$ 261,000			$ 261,000		0
Debt issuance costs			(7,729)			(7,729)
Net Carrying Amount			253,271			253,271
Interest expense
Contractual interest expense			1,371			3,127
Amortization of debt issuance costs			328			735
Total interest and amortization expense			1,699			$ 3,862
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
Portion of debt instrument face amount, Exercised				$ 36,000
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 \| 2023 Notes
Debt
Loan amount		$ 287,500
Debt Instrument, annual interest rate		2.125%
Conversion price (dollars per share) \| $ / shares		$ 27.79
Debt instrument maturity date		Jan. 15, 2023
Ratio of repurchase price to the principal amount						100.00%
Debt Instrument, Repurchased Face Amount				$ 144,800						$ 144,800			$ 14,100
Principal			96,204			$ 96,204		240,984	$ 96,200	96,200
Debt discount and issuance costs, net			(73)			(73)		$ (620)		$ 200
Interest expense
Contractual interest expense			511		1,280	2,106	3,840
Amortization of debt issuance costs			59		143	240	431
Total interest and amortization expense			$ 570		$ 1,423	$ 2,346	$ 4,271
Convertible subordinated notes \| 2023 Notes \| Privately-negotiated capped call option
Debt
Cap price for the underlying number of shares (in dollars per share) \| $ / Item		38.00												38.00