BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 51,722	$ 49,720
Short-term Investments	4,474
Prepaid expenses and other current assets	1,571	428
Total current assets	57,767	50,148
Property and equipment, net	31	44
Investments	1,488
Other assets	376	21
Total assets	59,662	50,213
Current liabilities:
Current portion of notes payable	2,128
Accounts payable	3,146	536
Accrued expenses	2,161	1,503
Total current liabilities	7,435	2,039
Notes payable	5,250	7,000
Other long-term liabilities	56	20
Total liabilities	$ 12,741	$ 9,059
Commitments and contingencies (Note 8)
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, 19,420,086 issued and 19,390,855 outstanding at December 31, 2015 and 14,036,985 issued and 14,007,754 outstanding at December 31, 2014	$ 19	$ 14
Additional paid-in capital	$ 144,088	$ 113,476
Treasury stock at cost, 29,231 shares at December 31, 2015 and 2014
Accumulated deficit	$ (97,186)	$ (72,336)
Total stockholders’ equity	46,921	41,154
Total liabilities and stockholders’ equity	$ 59,662	$ 50,213