Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 68,624	$ 6,178
Prepaid expenses and other current assets	886	1,013
Total current assets	69,510	7,191
Property and equipment, net	416	474
Restricted cash	334	334
Other assets	1,560	347
Total assets	71,820	8,346
Current liabilities:
Accounts payable	1,283	1,887
Accrued expenses and other liabilities	3,898	6,503
Capital lease obligations	23	21
Deferred rent	53	57
Convertible notes, related party		29,770
Total current liabilities	5,257	38,238
Capital lease obligations	23	40
Deferred rent	194	219
Term loan	15,013	14,789
Preferred stock warrant liabilities		2,460
Total liabilities	$ 20,487	$ 55,746
Commitments and contingencies (Note 11)
Convertible preferred stock		$ 61,982
Stockholders’ equity (deficit):
Preferred stock, par value $0.001; 1,000,000 and no shares authorized at September 30, 2015 and December 31, 2014, respectively; no shares issued and outstanding at September 30, 2015 and December 31, 2014
Common stock, par value $0.001; 500,000,000 shares authorized and 18,809,993 shares issued and outstanding at September 30, 2015; common stock, par value $0.0001; 8,456,867 shares authorized and 403,539 shares issued and outstanding at December 31, 2014	$ 19
Additional paid-in capital	205,304	$ 4,378
Accumulated deficit	(153,990)	(113,760)
Total stockholders’ equity (deficit)	51,333	(109,382)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	$ 71,820	$ 8,346