Summary of Significant Accounting Policies - Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Subsidiary, Sale of Stock [Line Items]
Total cash and cash equivalents	$ 304,320	$ 100,130
Preferred stock warrant liability	0	177
Fair Value, Measurements, Recurring
Subsidiary, Sale of Stock [Line Items]
Cash	13,621	1,502
Cash equivalents	290,699	98,628
Total cash and cash equivalents	304,320	100,130
Preferred stock warrant liability	0	177
Loan facility derivative liability	1,496	1,782
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1
Subsidiary, Sale of Stock [Line Items]
Cash	13,621	1,502
Cash equivalents	290,699	98,628
Total cash and cash equivalents	304,320	100,130
Preferred stock warrant liability	0	0
Loan facility derivative liability	0	0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Subsidiary, Sale of Stock [Line Items]
Cash	0	0
Cash equivalents	0	0
Total cash and cash equivalents	0	0
Preferred stock warrant liability	0	0
Loan facility derivative liability	0	0
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 3
Subsidiary, Sale of Stock [Line Items]
Cash	0	0
Cash equivalents	0	0
Total cash and cash equivalents	0	0
Preferred stock warrant liability	0	177
Loan facility derivative liability	$ 1,496	$ 1,782

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