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The price per share of the conversion feature embedded in the debt instrument.

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Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Percentage of principal amount of debt redeemed.

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The amount of debt issuance costs that were incurred during a noncash or partial noncash transaction.

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The cap rate on a price risk derivative such as a cap or collar. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Debt - Convertible Notes (Details)		1 Months Ended	3 Months Ended		9 Months Ended
Debt - Convertible Notes (Details)	Sep. 04, 2019 $ / shares $ / unit	Sep. 30, 2019 USD ($) d $ / shares	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
Aggregate principal amount		$ 316,250,000	$ 316,250,000		$ 316,250,000
Debt instrument trading days \| d		20
Debt instrument consecutive trading day \| d		30
Debt issuance costs related with equity component of convertible debt			3,725,000
Premiums for capped call options			32,890,000
Interest expense			6,600,000	$ 800,000	9,000,000.0	$ 1,700,000
Call Option
Debt Instrument [Line Items]
Capped price (in dollars per share) \| $ / unit	37.00
Premium of cap price as a percentage of closing price	100.00%
Common Stock
Debt Instrument [Line Items]
Closing stock price (in dollars per share) \| $ / shares	$ 18.50
Convertible Notes
Debt Instrument [Line Items]
Interest expense			1,400,000
Convertible Notes \| 2024 Notes
Debt Instrument [Line Items]
Aggregate principal amount		$ 316,250,000	$ 316,250,000		$ 316,250,000
Debt instrument, interest rate percentage		1.50%	1.50%		1.50%
Debt instrument, effective conversion price (in dollars per share) \| $ / shares	$ 24.98
Stock price trigger, premium on closing price (as a percent)	35.00%
Redemption price (as a percent)	100.00%	100.00%
Stock price trigger (as a percent)		130.00%
Debt issuance costs incurred			$ 9,200,000
Debt issuance costs, net		$ 5,500,000	5,500,000		$ 5,500,000
Debt issuance costs related with equity component of convertible debt			3,700,000
Equity component of convertible debt		$ 128,400,000	$ 128,400,000		$ 128,400,000
Convertible Notes \| 2024 Notes \| Common Stock
Debt Instrument [Line Items]
Debt instrument, conversion price (in dollars per share) \| $ / shares		$ 0.04004	$ 0.04004		$ 0.04004