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Equity (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Stock_Based Compensation  
Unrecognized compensation costs related to non-vested stock option awards $ 3,647
Unrecognized compensation costs related to non-vested stock option awards, recognition period 3 years 6 months
Grants (in shares) 31,875
Weighted average fair value of options granted $ 196
Expected dividend yield (as a percent) 0.00%
Expected life 6 years 6 months
Vesting period of options 4 years
Contractual life of options 10 years
Shares authorized for grant 1,019,856
Minimum
 
Stock_Based Compensation  
Expected stock price volatility (as a percent) 98.30%
Risk-free interest rate (as a percent) 1.38%
Maximum
 
Stock_Based Compensation  
Expected stock price volatility (as a percent) 98.60%
Risk-free interest rate (as a percent) 1.43%