Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 108,352	$ 125,699
Prepaid expenses and other current assets	2,183	2,043
Income tax receivable	4,706	882
Total current assets	115,241	128,624
Property and equipment, net	135	173
Right-of-use asset, net	326	496
Income tax receivable, non-current	0	882
Other assets	12	12
Total assets	115,714	130,187
Current liabilities
Accrued research and development expenses	8,384	6,860
Accounts payable and accrued expenses	2,375	5,629
Lease liability	219	495
Total current liabilities	10,978	12,984
Operating Lease, Liability, Noncurrent	106	0
Total liabilities	11,084	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, 49,731,811 and 49,627,064 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	50	50
Additional paid-in capital	600,182	597,679
Accumulated deficit	(495,602)	(480,526)
Total stockholders' equity	104,630	117,203
Total liabilities and stockholders' equity	$ 115,714	$ 130,187