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Debt - Convertible Notes (Details)		3 Months Ended			9 Months Ended	12 Months Ended
Debt - Convertible Notes (Details)	Sep. 04, 2019 $ / shares	Sep. 30, 2020 USD ($) $ / unit	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) d $ / unit	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Principal amount		$ 316,250,000	$ 316,250,000		$ 316,250,000	$ 316,250,000
Debt instrument, convertible, conversion ratio	0.04004
Convertible notes fair value of liability component				$ 187,900,000
Equity component of convertible debt				128,400,000
Premiums for capped call options				32,890,000
Call Option
Debt Instrument [Line Items]
Capped price (in dollars per share) \| $ / unit		37.00			37.00
Premium of cap price as a percentage of closing price		100.00%			100.00%
Premiums for capped call options					$ 32,900,000
Convertible notes
Debt Instrument [Line Items]
Principal amount				$ 316,250,000
Interest rate				1.50%
Redemption price (as a percent)					100.00%
Stock price trigger (as a percent)					130.00%
Debt instrument trading days \| d					20
Debt instrument consecutive trading day \| d					30
Debt issuance costs incurred			9,200,000
Debt issuance costs, net			$ 5,500,000			5,500,000
Debt issuance costs related with equity component of convertible debt						$ 3,700,000
Interest expense		$ 6,700,000			$ 19,600,000
Convertible notes \| COMMON STOCK
Debt Instrument [Line Items]
Debt instrument, convertible conversion price (in dollars per share) \| $ / shares	$ 24.98
Stock price trigger, premium on closing price (as a percent)	35.00%
Closing stock price (in dollars per share) \| $ / shares	$ 18.50