Debt - Summary of Information about the Equity and Liability Components of Notes (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Apr. 08, 2021	Dec. 31, 2020	Feb. 10, 2020	Apr. 15, 2019
Debt Instrument [Line Items]
Total long-term portion of notes payable	$ 279,087,000		$ 279,087,000			$ 105,844,000
Contractual interest expense	3,196,000	$ 1,000,000	4,213,000	$ 2,015,000
Amortization of debt issuance costs and discount	1,737,000	1,102,000	2,917,000	2,059,000
Total interest expense	4,933,000	$ 2,102,000	7,130,000	$ 4,074,000
Convertible Notes
Debt Instrument [Line Items]
Principal amount of notes outstanding								$ 80,000,000.0
Convertible Notes | Convertible Senior Notes due 2024
Debt Instrument [Line Items]
Principal amount of notes outstanding	13,750,000		13,750,000
Unamortized discount and unamortized debt issuance cost	(2,271,000)		(2,271,000)
Total long-term portion of notes payable	11,479,000		11,479,000
Convertible Notes | Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Principal amount of notes outstanding	120,000,000		120,000,000				$ 120,000,000.0
Unamortized discount and unamortized debt issuance cost	(23,962,000)		(23,962,000)
Total long-term portion of notes payable	96,038,000		96,038,000
Credit Facility | Owl Rock Credit Agreement
Debt Instrument [Line Items]
Principal amount of notes outstanding	180,000,000		180,000,000		$ 180,000,000.0
Unamortized discount and unamortized debt issuance cost	(8,789,000)		(8,789,000)
Total long-term portion of notes payable	$ 171,211,000		$ 171,211,000