Unaudited Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 94,851	$ 131,201
Prepaid expenses and other current assets	1,110	2,086
Income tax receivable	1,012	0
Total current assets	96,973	133,287
Property and equipment, net	212	335
Right-of-use asset, net	745	0
Income tax receivable, non-current	882	3,529
Other assets	11	14
Total assets	98,823	137,165
Current liabilities
Accrued research and development expenses	4,950	7,337
Accounts payable and accrued expenses	3,666	5,869
Lease liability	745	0
Total current liabilities	9,361	13,206
Total liabilities	9,361	13,206
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, 41,601,639 and 41,397,197 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	42	41
Additional paid-in capital	552,468	545,585
Accumulated deficit	(463,048)	(421,667)
Total stockholders' equity	89,462	123,959
Total liabilities and stockholders' equity	$ 98,823	$ 137,165