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Newly Issued Accounting Standards (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	$ 98,957	$ 118,880	$ 136,504	$ 162,266	$ 171,200	$ 182,125	$ 32,067	$ (29,199)
Additional paid-in capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	546,565	544,094	542,093	566,916	565,440	615,207	497,249	434,391
Accumulated deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity	(425,455)	$ (403,453)	$ (383,872)	(384,187)	$ (372,909)	$ (361,206)	$ (392,080)	$ (391,215)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				(12,939)
Book value of long-term debt				12,939
Cumulative Effect, Period of Adoption, Adjustment | Additional paid-in capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				(26,699)
Cumulative Effect, Period of Adoption, Adjustment | Accumulated deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' equity				13,760
Senior Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Book value of long-term debt	$ 142,086			$ 128,210
4.50% Exchangeable Senior Notes Due 2023 | Senior Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt instrument, interest rate, stated percentage	4.50%			4.50%

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