Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 115,878	$ 98,849
Restricted cash	179	179
Accounts receivable	490	444
Prepaid expenses and other current assets	3,688	5,637
Total current assets	120,235	105,109
Other assets	166	166
Property and equipment, net	1,016	1,204
Total assets	121,417	106,479
Current liabilities:
Accounts payable	1,532	1,555
Accrued expenses and other current liabilities	2,384	3,341
Total current liabilities	3,916	4,896
Other long-term liabilities	193	272
Total liabilities	4,109	5,168
Commitments and contingencies (see Note 10)
Stockholders' equity:
Preferred stock, $0.01 par value, 10,000 shares authorized and no shares issued and outstanding as of June 30, 2020 and December 31, 2019
Common stock, $0.01 par value, 150,000 shares authorized as of June 30, 2020 and December 31, 2019, 46,850 and 33,739 issued and outstanding as of June 30, 2020 and December 31, 2019	468	337
Additional paid-in capital	307,015	263,922
Accumulated deficit	(190,175)	(162,948)
Total stockholders’ equity	117,308	101,311
Total liabilities and stockholders’ equity	$ 121,417	$ 106,479