BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 32,895	$ 51,722
Short-term investments	3,675	4,474
Prepaid expenses and other current assets	553	1,571
Total current assets	37,123	57,767
Property and equipment, net	1,016	31
Investments	496	1,488
Other assets		362
Total assets	38,635	59,648
Current liabilities:
Current portion of notes payable	3,500	2,128
Accounts payable	3,845	3,146
Accrued expenses	1,836	2,161
Total current liabilities	9,181	7,435
Notes payable	2,616	5,236
Other long-term liabilities	145	56
Total liabilities	11,942	12,727
Stockholders' equity:
Preferred stock, $0.001 par value; 25,000,000 shares authorized, no shares issued and outstanding
Common stock, $0.001 par value; 100,000,000 shares authorized, 19,734,726 issued and 19,705,495 outstanding at September 30, 2016 and 19,420,086 issued and 19,390,855 outstanding at December 31, 2015	20	19
Additional paid-in capital	146,487	144,088
Treasury stock at cost, 29,231 shares at September 30, 2016 and December 31, 2015
Accumulated deficit	(119,814)	(97,186)
Total stockholders’ equity	26,693	46,921
Total liabilities and stockholders’ equity	$ 38,635	$ 59,648