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           Employee Benefit Plan 
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        12 Months Ended | |
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           Dec. 31, 2014 
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| Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] | ||
| Employee Benefit Plans | 
  8. Employee Benefit Plan
   On January 1, 2008, the Company adopted a defined contribution 401(k) plan which allows employees to contribute up to a percentage of their compensation, subject to IRS limitations and provides for a discretionary Company match up to a maximum of  4% of employee compensation. For the years ended December 31, 2014, 2013 and 2012, the Company paid a matching contribution of $83,000, $107,000 and $85,000, respectively.   | 
      
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- Definition 
          The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. No definition available. 
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- Details 
          
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