Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net loss	$ (38,789)	$ (12,651)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation expense	2,599	1,347
Shares issued for services		124
Research and development expenses - license acquired		192
Change in fair value of warrant liability	750	(238)
Gain on forgiveness of note payable	(147)
Net loss on extinguishment of convertible debt	2,387
Amortization of debt discount	1,582
Changes in operating assets and liabilities
Prepaid expenses and other current assets	(2,230)	(782)
Accounts payable	1,514	(441)
Accrued expenses	1,803	(285)
Licenses payable	(125)	(4,850)
Net cash used in operating activities	(30,656)	(17,584)
Cash flows provided by financing activities
Payment of convertible note	(13,551)
Proceeds from issuance of common stock, net of issuance costs	97,957	8,850
Proceeds from issuance of common stock and warrants, pursuant to          Securities Purchase Agreement, net of issuance costs		6,380
Proceeds from exercise of warrants	7,252
Proceeds from exercise of options	65
Proceeds from sales of common stock under ESPP	104
Proceeds from note payable		147
Net cash provided by financing activities	91,827	15,377
Net increase (decrease) in cash	61,171	(2,207)
Cash, beginning of period	15,662	10,261
Cash, end of period	76,833	8,054
Supplemental disclosure of cash flow information:
Cash paid for interest	10	10
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	75
Issuance of common stock for convertible notes	69
Issuance of common stock for settlement of debt	1,377
Extinguishment of beneficial conversion feature	1,519
Issuance of common stock for license payable		$ 2,443