Convertible Senior Notes and Capped Call Transactions - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Disclosure [Abstract]
Contractual interest expense	$ 792	$ 791	$ 2,372	$ 1,221
Amortization of debt discount	1,420	1,354	4,214	1,996
Amortization of debt issuance costs	306	292	909	430
Total	$ 2,518	$ 2,437	$ 7,495	$ 3,647