BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 38,933	$ 49,720
Short-term Investments	995
Prepaid expenses and other current assets	207	428
Total current assets	40,135	50,148
Property and equipment, net of accumulated depreciation of $358 and $356	39	44
Investments	496
Other assets	370	21
Total assets	41,040	50,213
Current liabilities:
Current portion of long term debt	1,750
Accounts payable	1,097	536
Accrued expenses	3,000	1,503
Total current liabilities	5,847	2,039
Notes payable	5,250	7,000
Other long term liabilities	59	20
Total liabilities	$ 11,156	$ 9,059
Stockholders' equity
Preferred stock, $0.001 par value; 25,000,000 shares authorized, 0 shares issued and outstanding
Common stock, $0.001 par value; 100,000,000 shares authorized, 14,228,897 issued and 14,199,666 outstanding at March 31, 2015 and 14,036,985 issued and 14,007,754 outstanding at December 31, 2014	$ 14	$ 14
Additional paid-in capital	114,481	113,476
Accumulated deficit	(84,611)	(72,336)
Total stockholders’ equity	29,884	41,154
Total liabilities and stockholders’ equity	$ 41,040	$ 50,213