Convertible Senior Notes and Capped Call Transactions - Narrative (Details) $ / shares in Units, shares in Thousands	1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($) day $ / shares shares	Mar. 31, 2019 USD ($) equity_instrument day $ / shares shares	Sep. 30, 2022 USD ($) $ / shares	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares
Debt Instrument [Line Items]
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001	$ 0.001			$ 0.001		$ 0.001	$ 0.001
Interest expense			$ 1,400,000			$ 4,100,000
Number of shares of common stock covered by called caps (shares) | shares	6,880	5,960
Reduction to additional paid-in-capital related to called caps	$ 46,100,000	$ 23,200,000
Adjustments to additional paid in capital related to issuance costs attributable to equity component				$ 3,700,000
Net carry amount			736,475,000			736,475,000			$ 574,238,000
2024 Notes
Debt Instrument [Line Items]
Carry amount of equity component of convertible notes		52,900,000
Total deferred issuance costs		8,600,000
Debt issuance costs attributable to liability		6,600,000
Adjustments to additional paid in capital related to issuance costs attributable to equity component		$ 2,000,000
Net carry amount			227,500,000			227,500,000
Debt Issuance Costs, Net			2,500,000			2,500,000
2026 Notes
Debt Instrument [Line Items]
Carry amount of equity component of convertible notes									162,500,000
Total deferred issuance costs									12,200,000
Debt issuance costs attributable to liability									8,500,000
Net carry amount			509,000,000			509,000,000
Debt Issuance Costs, Net			$ 8,500,000			$ 8,500,000
Capped calls
Debt Instrument [Line Items]
Capped caps initial strike price (in dollars per share) | $ / shares	$ 75.23	$ 38.58						75.23
Capped caps initial cap price (in dollars per share) | $ / shares	$ 105.58	$ 57.16						$ 105.58
Convertible Debt | 2024 Notes
Debt Instrument [Line Items]
Aggregate principal		$ 230,000,000
Debt instrument stated rate (percent)		0.75%
Aggregate principal from exercise in full of over-allotment options		$ 30,000,000
Proceeds from debt offering, net of debt issuance costs		221,400,000
Debt instrument, unit of principal for conversion		$ 1,000
Number of shares per convertible note | equity_instrument		25.9182
Convertible debt conversion price (in dollars per share) | $ / shares		$ 38.58
Percentage of principal amount paid if repurchase due to fundamental change (percent)		100.00%
Threshold trading days in consideration of note conversion | day		20
Threshold consecutive trading days in analysis of conversion price | day		30
Threshold percentage of stock price if converted		130.00%
Threshold for five day period, product of sale price of common stock and conversion rate of notes		98.00%
Remaining amortization period for debt discount and debt issuance costs						1 year 4 months 24 days
Effective interest rate (percent)			0.0153%			0.0153%
Convertible Debt | 2026 Notes
Debt Instrument [Line Items]
Aggregate principal	$ 517,500,000							$ 517,500,000
Debt instrument stated rate (percent)	0.00%							0.00%
Aggregate principal from exercise in full of over-allotment options	$ 67,500,000							$ 67,500,000
Proceeds from debt offering, net of debt issuance costs								505,300,000
Debt instrument, unit of principal for conversion	$ 1,000							$ 1,000
Number of shares per convertible note	13.2933
Convertible debt conversion price (in dollars per share) | $ / shares	$ 75.23							$ 75.23
Percentage of principal amount paid if repurchase due to fundamental change (percent)	100.00%
Threshold trading days in consideration of note conversion | day	20
Threshold consecutive trading days in analysis of conversion price | day	30
Threshold percentage of stock price if converted	130.00%
Threshold for five day period, product of sale price of common stock and conversion rate of notes	98.00%
Remaining amortization period for debt discount and debt issuance costs						4 years 2 months 12 days
Effective interest rate (percent)			0.004%			0.004%
Convertible Debt | Convertible Senior Notes
Debt Instrument [Line Items]
Carry amount of equity component of convertible notes			$ 0			$ 0			215,434,000
Interest expense			1,377,000		$ 9,457,000	4,125,000	$ 27,922,000
Debt Issuance Costs, Net			$ 11,025,000			$ 11,025,000			$ 10,302,000