Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 121,020	$ 98,849
Restricted cash	179	179
Accounts receivable	818	444
Prepaid expenses and other current assets	4,114	5,637
Total current assets	126,131	105,109
Other assets	166	166
Property and equipment, net	1,101	1,204
Total assets	127,398	106,479
Current liabilities:
Accounts payable	1,850	1,555
Accrued expenses and other current liabilities	2,796	3,341
Total current liabilities	4,646	4,896
Other long-term liabilities	234	272
Total liabilities	4,880	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 March 31, 2020 and December 31, 2019
Common stock, $0.01 par value, 150,000 shares authorized as of March 31, 2020 and December 31, 2019, 45,546 and 33,739 issued and outstanding as of March 31, 2020 and December 31, 2019	455	337
Additional paid-in capital	299,721	263,922
Accumulated deficit	(177,658)	(162,948)
Total stockholders’ equity	122,518	101,311
Total liabilities and stockholders’ equity	$ 127,398	$ 106,479