Convertible Debt and Notes Payable - Convertible Debt (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019	Dec. 14, 2017
Debt and Capital Lease Obligations [Line Items]
Convertible debt	$ 0	$ 0	$ 80,808,000	[1]
Gain/(loss) on debt extinguishment		(4,538,000)	2,719,000		$ 0
Amortization of debt discount (premium)		6,727,000	4,490,000		4,598,000
Convertible Debt
Debt and Capital Lease Obligations [Line Items]
Unamortized discount			6,700,000
2022 convertible note | Convertible Debt
Debt and Capital Lease Obligations [Line Items]
Debt Instrument, Face Amount						$ 135,000,000
Debt Instrument, Convertible, Conversion Price						$ 17.375
Unamortized discount	5,100,000	5,100,000				$ 23,400,000
Debt Instrument, Repurchased Face Amount	88,100,000	$ 88,100,000	46,900,000
Extinguishment of Debt, Amount	70,500,000
Write off of pro rate unamortized discount while extinguishing debt	3,600,000
Write off of Deferred Debt Issuance Cost	400,000
Equity portion of convertible note extinguishment	29,600,000
Gain/(loss) on debt extinguishment	2,700,000
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		33.35%
Debt Issuance Costs, Net	$ 500,000	$ 500,000
Amortization of debt discount (premium)		6,700,000	4,600,000		4,300,000
Debt Instrument, Interest Rate, Effective Percentage						7.13%
Debt Issuance Costs, Gross						$ 2,200,000
Interest on Convertible Debt, Net of Tax		$ 1,200,000	$ 4,000,000		$ 4,100,000
2022 convertible note | Convertible Debt | Common Stock Class A
Debt and Capital Lease Obligations [Line Items]
Share settlement of convertible notes (in shares)		2,938,841

[1] The carrying amount of the convertible debt includes an unamortized discount of $6.7 million as of December 31, 2020.