CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 9,851	$ 10,757
Marketable securities	75,017	5,373
Prepaid expenses and other current assets	1,656	204
Total current assets	86,524	16,334
Marketable securities	7,170	518
Property and equipment, net	360	515
Other assets	22	10
Total assets	94,076	17,377
Current liabilities:
Accounts payable	810	1,263
Accrued expenses	745	188
Total current liabilities	1,555	1,451
Deferred rent		4
Total liabilities	$ 1,555	$ 1,455
Commitments and contingencies (Note 10)
Convertible preferred stock (Series A, B and C), $0.00001 par value; 34,090,000 shares authorized at December 31, 2014; 27,341,057 shares issued and outstanding at December 31, 2014; aggregate liquidation preference of $35,882 at December 31, 2014		$ 36,677
Stockholders' equity (deficit):
Preferred stock, $0.0001 par value; 100,000,000 and 77,000,000 shares authorized and no shares issued at December 31, 2015; no shares authorized at December 31, 2014
Additional paid-in capital	$ 135,503
Accumulated other comprehensive loss	(149)	$ (6)
Accumulated deficit	(42,833)	(20,749)
Total stockholders’ equity (deficit)	92,521	(20,755)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	$ 94,076	$ 17,377