Fair Value Measurements - Summary of Fair Value Measurements for Items (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. government and government agencies	$ 196,735	$ 53,963
Total assets at fair value	196,735	53,963
Derivative liabilities		44,810
Warrants payable		97,782
Total liabilities at fair value		142,592
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. government and government agencies	0	0
Total assets at fair value	0	0
Derivative liabilities		0
Warrants payable		0
Total liabilities at fair value		0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. government and government agencies	196,735	53,963
Total assets at fair value	196,735	53,963
Derivative liabilities		0
Warrants payable		0
Total liabilities at fair value		0
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
U.S. government and government agencies	0	0
Total assets at fair value	$ 0	0
Derivative liabilities		44,810
Warrants payable		97,782
Total liabilities at fair value		$ 142,592