CONSOLIIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 32,708	$ 30,171
Marketable securities	137,789	107,051
Prepaid expenses and other current assets	5,254	1,334
Total current assets	175,751	138,556
Marketable securities		36,912
Property and equipment, net	938	481
Deferred offering costs	99	116
Other assets	20	20
Total assets	176,808	176,085
Current liabilities:
Accounts payable	5,848	2,845
Accrued expenses	2,521	3,378
Total current liabilities	8,369	6,223
Other liabilities	295	372
Total liabilities	8,664	6,595
Stockholders' Equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued or outstanding at June 30, 2017 and December 31, 2016
Common stock, $0.00001 par value; 100,000,000 shares authorized at June 30, 2017 and December 31, 2016; 26,736,517 and 26,059,181 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively
Additional paid-in capital	286,619	260,671
Accumulated other comprehensive loss	(166)	(269)
Accumulated deficit	(118,309)	(90,912)
Total stockholders’ equity	168,144	169,490
Total liabilities and stockholders’ equity	$ 176,808	$ 176,085