Unaudited Consolidated Balance Sheets - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 122,819,000	$ 125,699,000
Available for sale securities	108,303,000	0
Prepaid expenses and other current assets	1,513,000	2,043,000
Income tax receivable	1,764,000	882,000
Total current assets	234,399,000	128,624,000
Property and equipment, net	62,000	173,000
Right-of-use asset, net	134,000	496,000
Income tax receivable, non-current	0	882,000
Other assets	0	12,000
Total assets	234,595,000	130,187,000
Current liabilities
Accrued research and development expenses	12,867,000	6,860,000
Accounts payable and accrued expenses	7,012,000	5,629,000
Lease liability	54,000	495,000
Total current liabilities	19,933,000	12,984,000
Lease liability, non-current	76,000	0
Total liabilities	20,009,000	12,984,000
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, 89,554,044 and 49,627,064 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	90,000	50,000
Additional paid-in capital	754,136,000	597,679,000
Accumulated deficit	(539,641,000)	(480,526,000)
Accumulated other comprehensive income	1,000	0
Total stockholders' equity	214,586,000	117,203,000
Total liabilities and stockholders' equity	$ 234,595,000	$ 130,187,000