Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 6,105	$ 101,969
Short-term investments	63,823
Prepaid expenses and other current assets	2,567	1,894
Total current assets	72,495	103,863
Long-term investments	1,997
Restricted cash	46	46
Property and equipment, net	931	861
Other assets	281
Total assets	75,750	104,770
Current liabilities:
Accounts payable	562	693
Accrued liabilities	3,271	3,428
Total current liabilities	3,833	4,121
Deferred rent	129	270
Other non-current liabilities		13
Total liabilities	$ 3,962	$ 4,404
Commitments and contingencies (Note 5)
Stockholders’ equity:
Preferred stock, $0.0001 par value per share, 10,000 shares authorized as of December 31, 2015 and 2014; no share issued and outstanding as of December 31, 2015 and 2014
Common stock, $0.0001 par value, 200,000 shares authorized as of December 31, 2015 and 2014; 18,232 and 17,943 shares issued and outstanding as of December 31, 2015 and 2014, respectively	$ 2	$ 2
Additional paid-in capital	156,353	152,218
Accumulated deficit	(84,498)	(51,854)
Accumulated other comprehensive loss	(69)
Total stockholders’ equity	71,788	100,366
Total liabilities and stock and stockholders’ equity	$ 75,750	$ 104,770