Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net loss	$ (27,974)	$ (8,561)
Adjustments to reconcile net loss to net cash used in operating activities
Stock-based compensation expense	1,742	652
Shares issued for services		124
Research and development expenses - license acquired		192
Change in fair value of warrant liability	826	(241)
Gain on forgiveness of note payable	(147)
Net loss on extinguishment of convertible debt	2,387
Amortization of debt discount	1,564
Changes in operating assets and liabilities
Prepaid expenses and other current assets	(1,214)	(864)
Accounts payable	(849)	(166)
Accrued expenses	644	(690)
Licenses payable	2,875	(3,850)
Net cash used in operating activities	(20,146)	(13,404)
Cash flows provided by financing activities
Payment of convertible note	(13,620)
Proceeds from issuance of common stock, net of issuance costs	97,957
Proceeds from issuance of common stock and warrants, pursuant to          Securities Purchase Agreement, net of issuance costs		8,850
Proceeds from exercise of warrants	7,252
Proceeds from exercise of options	65
Proceeds from sales of common stock under ESPP	30
Proceeds from note payable		147
Net cash provided by financing activities	91,684	8,997
Net increase (decrease) in cash	71,538	(4,407)
Cash, beginning of period	15,662	10,261
Cash, end of period	87,200	5,854
Supplemental disclosure of cash flow information:
Cash paid for interest	8	8
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	40
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