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Share-Based Compensation-Fair Value Assumption (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected term 6 years 6 years 6 years
Stock options granted (shares) 125,487 [1] 395,280 [1] 69,500 [1]
Weighted average grant date fair value (usd per share) $ 3.71 $ 5.09 $ 4.21
Fair value of grants $ 465 [1] $ 2,011 [1] $ 293 [1]
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Dividend yield 0.00% 0.00% 0.00%
Expected volatility, minimum 79.20% 78.50% 78.20%
Expected volatility, maximum 79.60% 79.70% 80.30%
Risk-free rate, minimum 0.80% 1.10% 1.50%
Risk-free rate, maximum 1.10% 2.20% 3.00%
Expected term 6 years 6 years 6 years
Forfeiture rate 5.00% 5.00% 5.00%
[1] Prior to applying estimated forfeiture rate