Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Trade accounts receivable, less allowance for doubtful accounts	$ 6	$ 6
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	24,088	24,088
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	35,000,000	35,000,000
Common stock, shares issued	28,585,496	28,516,163
Common stock, shares outstanding	28,585,496	28,516,163