Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 67,737	$ 143
Prepaid expenses and other current assets	475	309
Total current assets	68,212	452
Intangible assets	20
Restricted cash	70	71
Total assets	68,302	523
Current liabilities:
Accounts payable	13,078	5,046
Accrued expenses	5,463	3,308
Deferred revenue - current	1,874
Bridge notes		2,113
Convertible notes - current		2,033
Notes payable to vendors		1,094
Total current liabilities	20,415	13,594
Non-current liabilities:
Deferred revenue - non-current	2,342
Convertible notes - non current		1,247
Total non-current liabilities:	2,342	1,247
Total liabilities	22,757	14,841
Stockholders' equity (deficit):
Common stock, $0.001 par value: 225,000,000 shares authorized at December 31, 2020 and December 31, 2019; 51,626,508 and 22,806,890 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively	52	22
Additional paid-in capital	419,923	270,555
Accumulated deficit	(374,430)	(284,895)
Total stockholders' equity (deficit)	45,545	(14,318)
Total liabilities and stockholders' equity (deficit)	$ 68,302	$ 523