Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 66,373	$ 125,699
Available for sale securities	143,674	0
Prepaid expenses and other current assets	4,791	2,043
Income tax receivable	1,765	882
Total current assets	216,603	128,624
Property and equipment, net	26	173
Right-of-use assets, net	120	496
Income tax receivable, non-current	0	882
Other assets	5	12
Total assets	216,754	130,187
Current liabilities
Accrued research and development expenses	12,284	6,860
Accounts payable and accrued expenses	12,792	5,629
Lease liability, current	54	495
Total current liabilities	25,130	12,984
Lease liability, non-current	61	0
Total liabilities	25,191	12,984
Stockholders' equity
Preferred stock—$0.001 par value, 5,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock—0.001 par value, 200,000,000 shares authorized, 90,120,797 and 49,627,064 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively	90	50
Additional paid-in capital	756,543	597,679
Accumulated deficit	(565,073)	(480,526)
Accumulated other comprehensive income	3	0
Total stockholders' equity	191,563	117,203
Total liabilities and stockholders' equity	$ 216,754	$ 130,187