CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 17,796	$ 9,851
Marketable securities	66,246	75,017
Prepaid expenses and other current assets	1,548	1,656
Total current assets	85,590	86,524
Marketable securities		7,170
Property and equipment, net	461	360
Other assets	20	22
Total assets	86,071	94,076
Current liabilities:
Accounts payable	1,774	810
Accrued expenses	2,817	745
Total current liabilities	4,591	1,555
Other liabilities	358
Total liabilities	4,949	1,555
Stockholders' Equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued or outstanding at September 30, 2016 and December 31, 2015
Common stock, $0.00001 par value; 100,000,000 shares authorized at September 30, 2016 and December 31, 2015; 21,423,995 and 20,157,503 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively
Additional paid-in capital	160,613	135,503
Accumulated other comprehensive income (loss)	(54)	(149)
Accumulated deficit	(79,437)	(42,833)
Total stockholders’ equity	81,122	92,521
Total liabilities and stockholders’ equity	$ 86,071	$ 94,076