Condensed Consolidated Balance Sheets (Unaudited) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 35,983,000	$ 68,840,000
Available-for-sale investments	34,565,000	14,755,000
Prepaid expenses and other current assets	829,000	1,006,000
Total current assets	71,377,000	84,601,000
Property and equipment, net	221,000	83,000
Other non-current assets	686,000	114,000
Total assets	72,284,000	84,798,000
Liabilities and stockholders’ equity
Accounts payable	591,000	917,000
Accrued expenses	2,235,000	$ 1,421,000
Other current liabilities	342,000
Total current liabilities	3,168,000	$ 2,338,000
Other non-current liabilities	84,000
Total liabilities	$ 3,252,000	$ 2,338,000
Commitments and contingencies (Note 5)
Stockholders’ equity:
Preferred stock, $0.001 par value per share; 10,000,000 shares authorized, no shares issued and outstanding at September 30, 2015 and December 31, 2014	$ 0	$ 0
Common stock, $0.001 par value, 100,000,000 shares authorized at September 30, 2015 and December 31, 2014; 16,479,508 and 16,448,455 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively	16,000	16,000
Additional paid-in capital	193,919,000	192,324,000
Accumulated deficit	(124,909,000)	(109,874,000)
Accumulated other comprehensive income (loss)	6,000	(6,000)
Total stockholders’ equity	69,032,000	82,460,000
Total liabilities and stockholders’ equity	$ 72,284,000	$ 84,798,000