CONSOLIIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 30,171	$ 9,851
Marketable securities	107,051	75,017
Prepaid expenses and other current assets	1,334	1,656
Total current assets	138,556	86,524
Marketable securities	36,912	7,170
Property and equipment, net	481	360
Deferred offering costs	116	0
Other assets	20	22
Total assets	176,085	94,076
Current liabilities:
Accounts payable	2,845	810
Accrued expenses	3,378	745
Total current liabilities	6,223	1,555
Other liabilities	372
Total liabilities	6,595	1,555
Stockholders' Equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued or outstanding at December 31, 2016 and December 31, 2015
Common stock, $0.00001 par value; 100,000,000 shares authorized at December 31, 2016 and December 31, 2015; 26,059,181 and 20,157,503 shares issued and outstanding at December 31, 2016 and December 31, 2015, respectively
Additional paid-in capital	260,671	135,503
Accumulated other comprehensive loss	(269)	(149)
Accumulated deficit	(90,912)	(42,833)
Total stockholders’ equity	169,490	92,521
Total liabilities and stockholders’ equity	$ 176,085	$ 94,076