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Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	$ 1,106,917		$ 609,635	$ 498,829	$ 410,634
Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	1,449,305		1,030,577	916,095	818,113
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity	$ (337,191)		(422,601)	(416,292)	(406,576)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity			(378,138)	(88)	(111)
Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity			(465,006)
Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity			$ 86,868	$ (88)	$ (111)
Accounting Standards Update 2020-06 | Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-In Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity		$ 465,000
Accounting Standards Update 2020-06 | Cumulative Effect, Period of Adoption, Adjustment | Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity		86,900
Accounting Standards Update 2020-06 | Cumulative Effect, Period of Adoption, Adjustment | Convertible Senior Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity		$ 378,100

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