Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 21,202	$ 16,756
Other current assets	599	169
Total current assets	21,801	16,925
Property and equipment, net	26	29
Other assets	828	130
Total assets	22,655	17,084
Current liabilities:
Accounts payable	552	597
Accrued compensation and employee benefits	111	459
Accrued expenses and other liabilities	457	446
Deferred rent, current portion
Total current liabilities	1,120	1,502
Deferred rent, net of current portion	1	1
Total liabilities	1,121	1,503
Commitments and contingencies
Stockholders’ equity:
Series A convertible preferred stock, $0.001 par value; 135,000 shares authorized, no shares issued and outstanding at March 31, 2014 and December 31, 2013
Common stock, $0.001 par value; 100 million shares authorized at March 31, 2014 and December 31, 2013; 21,001,690 and 15,685,562 shares issued and outstanding at March 31, 2014 and December 31, 2013, respectively	21	16
Additional paid-in capital	98,835	90,498
Deficit accumulated during the development stage	(77,322)	(74,933)
Total stockholders’ equity	21,534	15,581
Total liabilities and stockholders’ equity	$ 22,655	$ 17,084