CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 31,815	$ 9,851
Marketable securities	62,195	75,017
Prepaid expenses and other current assets	1,628	1,656
Total current assets	95,638	86,524
Marketable securities		7,170
Property and equipment, net	434	360
Other assets	20	22
Total assets	96,092	94,076
Current liabilities:
Accounts payable	3,309	810
Accrued expenses	2,198	745
Total current liabilities	5,507	1,555
Other liabilities	345
Total liabilities	5,852	1,555
Stockholders' Equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued or outstanding at June 30, 2016 and December 31, 2015
Common stock, $0.00001 par value; 100,000,000 shares authorized at June 30, 2016 and December 31, 2015; 21,403,005 and 20,157,503 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively
Additional paid-in capital	158,982	135,503
Accumulated other comprehensive income (loss)	1	(149)
Accumulated deficit	(68,743)	(42,833)
Total stockholders’ equity	90,240	92,521
Total liabilities and stockholders’ equity	$ 96,092	$ 94,076