Condensed Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Accumulated depreciation	$ 272	$ 268
Accumulated amortization on license agreements	$ 1,430	$ 1,406
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000	15,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	70,000	70,000
Common stock, shares issued	15,294	5,586
Common stock, shares outstanding	15,294	5,586