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Earnings Per Share (Earnings Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]        
Net loss $ (1,243) $ (2,300) $ (7,403) $ (7,189)
Weighted average shares outstanding - basic and diluted (in shares) [1] 25,735 23,007 24,210 22,629
Net loss per share - basic and diluted (in usd per share) $ (0.05) $ (0.10) $ (0.31) $ (0.32)
Stock issued during period under registered offering, shares     3,738  
[1] The increase in shares from the 2014 periods to the 2015 periods is due primarily to the weighted average effect of the sale of 3,738 shares of common stock in an underwritten registered offering during August 2015.