CONSOLIIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 23,677	$ 30,171
Marketable securities	129,741	107,051
Prepaid expenses and other current assets	3,931	1,334
Total current assets	157,349	138,556
Marketable securities	8,019	36,912
Property and equipment, net	706	481
Deferred offering costs	116	116
Other assets	20	20
Total assets	166,210	176,085
Current liabilities:
Accounts payable	3,604	2,845
Accrued expenses	2,033	3,378
Total current liabilities	5,637	6,223
Other liabilities	284	372
Total liabilities	5,921	6,595
Stockholders' Equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued or outstanding at March 31, 2017 and December 31, 2016
Common stock, $0.00001 par value; 100,000,000 shares authorized at March 31, 2017 and December 31, 2016; 26,097,118 and 26,059,181 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively
Additional paid-in capital	264,009	260,671
Accumulated other comprehensive loss	(249)	(269)
Accumulated deficit	(103,471)	(90,912)
Total stockholders’ equity	160,289	169,490
Total liabilities and stockholders’ equity	$ 166,210	$ 176,085