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Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Convertible senior notes, net carrying value	$ 139,286		$ 99,575
Accumulated deficit	(312,197)		(333,147)
Additional paid-in capital	482,197		519,143
Interest Expense	5,721	$ 4,823
Net income	$ 15,662	$ 450
Earnings per share - diluted (in dollars per share)	$ 0.41	$ 0.01
Accounting Standards Update 2020-06 | Adjustment
Convertible senior notes, net carrying value			39,489
Accumulated deficit			(5,288)
Additional paid-in capital			$ (44,777)
Interest Expense	$ (1,552)
Net income	$ 1,552
Earnings per share - diluted (in dollars per share)	$ 0.02

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