Debt, Commitments and Contingencies - Summary of Interest Expense (Details) - Convertible Senior Notes due 2026 - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Amortization of debt discount	$ 3,592	$ 0	$ 6,404	$ 0
Amortization of debt issuance costs	557	0	989	0
Total interest expense	$ 4,149	$ 0	$ 7,393	$ 0

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration