Condensed Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Condensed Balance Sheets [Abstract]
Accumulated amortization on license agreements	$ 1,333	$ 1,309
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000	15,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000	100,000
Common stock, shares issued	2,075	1,746
Common stock, shares outstanding	2,075	1,746