Consolidated Balance Sheets - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 154,666,000	$ 51,660,000
Prepaid expenses and other current assets	1,048,000	24,000
Total current assets	155,714,000	51,684,000
Equipment, net	164,000	134,000
Restricted cash	55,000	0
Deferred offering costs	2,303,000	0
Other non-current assets	59,000	8,000
Total assets	158,295,000	51,826,000
Current liabilities:
Accounts payable	1,964,000	416,000
Amounts due to related party	0	1,707,000
Accrued expenses and other current liabilities	2,899,000	452,000
Total current liabilities	4,863,000	2,575,000
Derivative liabilities	16,000	4,023,000
Total liabilities	4,879,000	6,598,000
Commitments and contingencies (Note 11)	0	0
Convertible preferred stock (series A, B and C); $0.0001 par value; 64,871,795 shares authorized at December 31, 2019 and 44,867,089 shares authorized at December 31, 2018; 64,839,353 shares issued and outstanding at December 31, 2019 and 33,668,075 shares issued and outstanding at December 31, 2018; aggregate liquidation preference of $194,727 at December 31, 2019 and $65,002 at December 31, 2018	200,573,000	60,770,000
Stockholders' equity (deficit):
Common stock; $0.0001 par value; 80,000,000 shares authorized at December 31, 2019 and 57,803,522 shares authorized at December 31, 2018; 2,236,672 shares issued and outstanding at December 31, 2019 and 2,173,684 shares issued and outstanding at December 31, 2018	1,000	1,000
Additional paid-in capital	3,812,000	169,000
Accumulated deficit	(50,970,000)	(15,712,000)
Total stockholders' equity (deficit)	(47,157,000)	(15,542,000)
Total liabilities, convertible preferred stock and stockholders' equity (deficit)	$ 158,295,000	$ 51,826,000