Condensed Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Preferred stock, shares authorized	5,000	5,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	140,000	140,000
Shares issued	27,645	27,643
Common stock, shares outstanding	27,645	27,643
Series A Convertible Preferred Stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares designated	1,500	1,500
Preferred stock, shares issued	1	1
Preferred Stock, shares outstanding	1	1
Series E Preferred Stock
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares designated	424	424
Preferred stock, shares issued	424	424
Preferred Stock, shares outstanding	424	424
Series E preferred stock, Liquidation Preference	$ 6,048	$ 6,048
Series D Convertible Redeemable Preferred Stock
Series D Redeemable convertible preferred stock, par value	$ 0.01	$ 0.01
Series D Redeemable convertible preferred stock, shares designated	1,124	1,124
Series D Redeemable convertible preferred stock, shares issued	1,124	1,124
Series D Redeemable convertible preferred stock, shares outstanding	1,124	1,124
Series D Redeemable convertible preferred stock, redemption amount	9,149
Series D Redeemable convertible preferred stock, liquidation preference	$ 9,389