Debt - Narrative (Details) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended
	Jul. 31, 2020 USD ($) day	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares shares	Dec. 31, 2019 $ / shares
Debt Instrument [Line Items]
Loss on extinguishment of debt	$ (7,300,000)	$ (7,276,000)	$ 0		$ (7,276,000)	$ 0
Exchange agreement, aggregate principal amount			$ 247,200,000			$ 247,200,000
Shares authorized for issuance (in shares) | shares			44.0			44.0
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01		$ 0.01	$ 0.01	$ 0.01
Exchange agreement, accrued and unpaid interest						$ 1,300,000
Gain (loss) on extinguishment of debt, additional paid-in capital			$ 215,000,000.0			215,000,000.0
Gain (loss) on extinguishment of debt, fair value of common shares issued			400,000			400,000
Loss on exchange of convertible notes		$ 0	$ 0		$ 0	40,624,000
Proceeds from termination of capped call confirmations				$ 19,900,000	$ 0	$ 19,875,000
Senior Secured Term Loan due 2023 | Senior Loans
Debt Instrument [Line Items]
Voluntary settlement of senior debt	156,300,000
Accrued interest expense	1,100,000
Early settlement premiums	5,200,000
Secured Debt | Senior Secured Term Loan due 2026
Debt Instrument [Line Items]
Credit facility maximum borrowing amount	$ 400,000,000
Number of quarterly payments | day	9
Quarterly payment amount	$ 44,400,000
Proceeds from credit facility	385,900,000
Voluntary settlement of senior debt	156,300,000
Accrued interest expense	1,100,000
Early settlement premiums	$ 5,200,000
Secured Debt | Senior Secured Term Loan due 2026 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate (in percent)	1.00%
Basis spread on variable rate (in percent)	6.50%
Secured Debt | Senior Secured Term Loan due 2026 | Senior Loans
Debt Instrument [Line Items]
Credit facility maximum borrowing amount	$ 400,000,000
Proceeds from credit facility	385,900,000
Minimum liquidity covenant	75,000,000
Secured Debt | Senior Secured Term Loan due 2026 | Minimum | Senior Loans
Debt Instrument [Line Items]
Minimum consolidated revenue covenant	$ 140,000,000
Secured Debt | Senior Secured Term Loan due 2026 | Minimum | Senior Loans | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable rate (in percent)	1.00%
Secured Debt | Senior Secured Term Loan due 2026 | Maximum | Senior Loans
Debt Instrument [Line Items]
Minimum consolidated revenue covenant	$ 225,000,000
Secured Debt | Senior Secured Term Loan due 2026 | Maximum | Senior Loans | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	6.50%