Debt - 2018 Oaktree Term Loan Agreement - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	May 31, 2019	Nov. 30, 2018
Debt Instrument [Line Items]
Loss on debt extinguishment			$ (51,939,000)
Interest expense	$ 2,563,000	$ 9,459,000	17,686,000	$ 28,059,000
Oaktree Capital Management, L.P. | Oaktree Term Loan
Debt Instrument [Line Items]
Face value of loan					$ 20,000,000.0	$ 100,000,000.0
Repayments of debt			120,000,000.0
Debt prepayment costs			9,400,000
Loss on debt extinguishment			51,900,000
Interest expense	0.0	500,000	3,000,000.0	1,400,000
Amount of debt discount and debt issuance included in interest expense	$ 0.0	$ 600,000	$ 2,200,000	$ 1,700,000