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Debt - Senior Notes (Details)	1 Months Ended			3 Months Ended		9 Months Ended
	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($) day	Jun. 30, 2020 USD ($) day $ / shares	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) $ / shares	Sep. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Stockholders' equity	$ 175,120,000	$ 183,292,000		$ 150,116,000	$ 170,458,000	$ 150,116,000	$ 170,458,000	$ 158,815,000	$ 164,436,000	$ 169,900,000		$ 315,572,000
Long-term debt				355,067,000		355,067,000				353,564,000
Cash interest expense				2,826,000	2,814,000	8,461,000	13,200,000
Amortization of debt issuance costs				529,000	511,000	1,504,000	1,671,000
Additional Paid-In Capital
Debt Instrument [Line Items]
Stockholders' equity	875,041,000	862,673,000		943,083,000	887,192,000	943,083,000	887,192,000	930,658,000	916,191,000	903,470,000		913,115,000
Accumulated Deficit
Debt Instrument [Line Items]
Stockholders' equity	$ (699,922,000)	(679,382,000)		(792,968,000)	$ (716,735,000)	(792,968,000)	(716,735,000)	$ (771,844,000)	$ (751,756,000)	(733,571,000)		(597,544,000)
Cumulative effect adjustment
Debt Instrument [Line Items]
Stockholders' equity												(42,399,000)
Cumulative effect adjustment | Additional Paid-In Capital
Debt Instrument [Line Items]
Stockholders' equity												(45,452,000)
Cumulative effect adjustment | Accumulated Deficit
Debt Instrument [Line Items]
Stockholders' equity												$ 3,053,000
Cumulative effect adjustment | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Long-term debt											$ 42,400,000
Cumulative effect adjustment | Accounting Standards Update 2020-06 | Additional Paid-In Capital
Debt Instrument [Line Items]
Stockholders' equity											(45,500,000)
Cumulative effect adjustment | Accounting Standards Update 2020-06 | Accumulated Deficit
Debt Instrument [Line Items]
Stockholders' equity											$ 3,100,000
Convertible Senior Notes | 2025 Notes
Debt Instrument [Line Items]
Aggregate principal amount			$ 150,000,000
Stated interest rate			5.00%
Total issuance costs			$ 5,700,000
Proceeds from issuance of debt, net of discounts and debt issuance costs			$ 144,300,000
Long-term debt				$ 146,474,000		$ 146,474,000				145,729,000
Effective interest rate				5.80%		5.80%
Cash interest expense						$ 5,600,000	5,600,000
Amortization of debt discount and issuance costs						$ 700,000	700,000
Conversion rate	0.0793903
Conversion price (in dollars per share) | $ / shares			$ 12.60	$ 12.60		$ 12.60
Threshold percentage of stock price trigger for redemption			130.00%
Period over which default must be cured or waived after notice is given			60 days
Amount of judgment payments rendered that classify as an event of default			$ 10,000,000
Discharge or stay period for judgment			45 days
Percent of the aggregate principal amount due upon event of default			25.00%
Special interest rate period			180 days
Special interest rate			0.50%
Convertible Senior Notes | 2025 Notes | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Estimated fair value of long-term debt				$ 140,700,000		$ 140,700,000
Convertible Senior Notes | 2025 Notes | Conversion Condition 1
Debt Instrument [Line Items]
Threshold percentage of stock price trigger for conversion			130.00%
Threshold trading days for conversion | day			20
Threshold consecutive trading days for conversion | day			30
Convertible Senior Notes | 2025 Notes | Conversion Condition 2
Debt Instrument [Line Items]
Threshold percentage of stock price trigger for conversion			98.00%
Threshold consecutive trading days for conversion | day			10
Convertible Senior Notes | 2026 Notes
Debt Instrument [Line Items]
Aggregate principal amount		$ 212,750,000
Stated interest rate		0.75%
Long-term debt				$ 208,593,000		$ 208,593,000				$ 207,835,000
Effective interest rate				1.30%		1.30%
Cash interest expense						$ 1,200,000	900,000
Conversion rate		0.0358616
Conversion price (in dollars per share) | $ / shares				$ 27.89		$ 27.89
Threshold percentage of stock price trigger for redemption		130.00%
Period over which default must be cured or waived after notice is given		60 days
Percent of the aggregate principal amount due upon event of default		25.00%
Special interest rate period		180 days
Special interest rate		0.50%
Estimated fair value of long-term debt				$ 148,700,000		$ 148,700,000
Debt issuance costs and discount		$ 5,700,000
Proceeds from the issuance of debt		$ 207,000,000
Threshold trading days for redemption | day		20
Threshold consecutive trading days for redemption | day		30
Cure period		30 days
Default on debt by the Company or subsidiary that classifies as an Event of Default		$ 10,000,000
Amortization of debt issuance costs						$ 800,000	$ 600,000
Convertible Senior Notes | 2026 Notes | Conversion Condition 1
Debt Instrument [Line Items]
Threshold percentage of stock price trigger for conversion		130.00%
Threshold trading days for conversion | day		20
Threshold consecutive trading days for conversion | day		30
Convertible Senior Notes | 2026 Notes | Conversion Condition 2
Debt Instrument [Line Items]
Threshold percentage of stock price trigger for conversion		98.00%
Threshold consecutive trading days for conversion | day		10

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