CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 142,250	$ 61,084
Short-term investments	236,238	64,993
Accrued interest	423	262
Unbilled grant receivables	169	298
Prepaid expenses and other current assets	4,861	676
Total current assets	383,941	127,313
Property and equipment	295	350
Operating lease right-of-use assets	9,474	11,759
Total assets	393,710	139,422
Current liabilities:
Accounts payable	1,843	630
Accrued expenses	7,849	5,163
Operating lease liability, current	3,188	3,067
Amount due to related party	641	246
Total current liabilities	13,521	9,106
Operating lease liability, long term	6,286	8,692
Total liabilities	19,807	17,798
Preferred stock
Preferred stock, value		173,127
Stockholders’ equity (deficit):
Preferred stock, $0.0001 par value: 10,000,000 shares authorized at September 30, 2020 and 0 at December 31, 2019; 0 issued and outstanding at September 30, 2020 and December 31, 2019, respectively
Common stock, $0.0001 par value: 150,000,000 and 90,000,000 shares authorized at September 30, 2020 and December 31, 2019, respectively; 65,106,873 and 6,502,929 issued at September 30, 2020 and December 31, 2019, respectively; 61,659,533 and 2,099,740 outstanding at September 30, 2020 and December 31, 2019, respectively	7
Additional paid-in capital	473,841	3,748
Accumulated other comprehensive (loss) income	(41)	68
Accumulated deficit	(99,904)	(55,319)
Total stockholders’ equity (deficit)	373,903	(51,503)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	$ 393,710	139,422
Series B Preferred Stock
Preferred stock
Preferred stock, value		120,923
Series A Preferred Stock
Preferred stock
Preferred stock, value		$ 52,204