Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net loss	$ (14,001)	$ (19,116)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation expense	2,232	705
Change in fair value of warrant liability	(234)	1,533
Change in fair value of convertible notes payable	244
Amortization of debt discount		986
Changes in operating assets and liabilities
Prepaid expenses and other current assets	(4,168)	(777)
Accounts payable	434	(259)
Accrued expenses	(178)	(199)
Derivative liability	(1,174)
Licenses payable	(200)	5,875
Net cash used in operating activities	(17,045)	(11,252)
Cash flows provided by financing activities
Payment of convertible note		(5,167)
Proceeds from issuance of common stock, net of issuance costs		33,481
Proceeds from exercise of warrants		5,868
Proceeds from exercise of options	8	65
Proceeds from sales of common stock under ESPP	75	30
Net cash provided by financing activities	83	34,277
Net increase (decrease) in cash	(16,962)	23,025
Cash, beginning of period	78,734	15,662
Cash, end of period	61,772	38,687
Supplemental disclosure of cash flow information:
Cash paid for interest	4	4
Cash paid for income taxes
Non-cash investing and financing activities:
Reclass of warrant liabilities related to Series A warrants exercised for cash		1,155
Right-of-use assets obtained in exchange for operating lease liabilities		$ 74