Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 114,214	$ 150,637
Restricted cash	179	252
Accounts receivable	461	578
Prepaid expenses and other current assets	3,980	1,784
Total current assets	118,834	153,251
Other assets	166	673
Property and equipment, net	1,330	1,690
Total assets	120,330	155,614
Current liabilities:
Accounts payable	1,750	1,889
Accrued expenses and other current liabilities	5,344	3,996
Total current liabilities	7,094	5,885
Other long-term liabilities	309	418
Total liabilities	7,403	6,303
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, 2019 and December 31, 2018
Common stock, $0.01 par value, 150,000 shares authorized as of June 30, 2019 and December 31, 2018, 33,608 and 33,341 issued and outstanding as of June 30, 2019 and December 31, 2018	337	333
Additional paid-in capital	261,760	254,516
Accumulated deficit	(149,170)	(105,538)
Total stockholders’ equity	112,927	149,311
Total liabilities and stockholders’ equity	$ 120,330	$ 155,614