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Equity (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Stock-Based Compensation      
Unrecognized compensation costs related to non-vested stock option awards $ 3,904    
Unrecognized compensation costs related to non-vested stock option awards, recognition period 3 years 9 months 18 days    
Grants (in shares) 39,700 29,375  
Weighted average fair value of options granted 185 173  
Expected dividend yield (as a percent) 0.00% 0.00%  
Expected stock price volatility (as a percent) 99.00% 98.50%  
Risk-free interest rate (as a percent) 1.30% 1.38%  
Expected life 5 years 6 years 6 months  
Vesting period of options 4 years    
Contractual life of options 10 years    
Shares authorized for grant 769,650    
Warrants      
Warrants outstanding (in shares) 1,633,253   1,633,253
Selling, general and administrative expense
     
Stock-Based Compensation      
Compensation expense 227 206  
Research and development expense
     
Stock-Based Compensation      
Compensation expense $ 140 $ 112