Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets
Cash	$ 41,251	$ 78,734
Prepaid expenses and other current assets	11,403	4,727
Total current assets	52,654	83,461
Operating lease right-of-use asset	13	39
Total assets	52,667	83,500
Current liabilities
Accounts payable	2,306	1,693
Accrued expenses	3,720	3,728
Licenses payable	1,000	200
Short-term portion of convertible notes payable, at fair value	7,447	1,030
Derivative liability		1,174
Warrant liabilities, at fair value	141	424
Operating lease liability	13	38
Total current liabilities	14,627	8,287
Convertible notes payable, at fair value	11,813	17,890
Total liabilities	26,440	26,177
Commitments and contingencies (note 12)
Stockholders’ equity
Common stock, $0.001 par value, 240,000,000 shares authorized,          106,190,773 and 105,500,445 issued and outstanding as of          June 30, 2022 and December 31, 2021, respectively	106	105
Additional paid-in-capital	202,604	198,428
Accumulated deficit	(176,483)	(141,210)
Total stockholders’ equity	26,227	57,323
Total liabilities and stockholders’ equity	$ 52,667	$ 83,500