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Stock Option and Equity Incentive Plans (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Options
Dec. 31, 2011
Options
Dec. 31, 2012
Employee Stock Option Plan
Dec. 31, 2012
Employee Stock Option Plan
Options
Dec. 31, 2012
Employee Stock Option Plan
Options
Minimum
Dec. 31, 2012
Employee Stock Option Plan
Options
Maximum
Dec. 31, 2012
Incentive Plan
item
Dec. 31, 2012
Incentive Plan
Options
Dec. 31, 2012
Non-Employee Director Stock Incentive Plan
Dec. 31, 2012
Non-Employee Director Stock Incentive Plan
Options
Stock Option and Equity Incentive Plans                    
Maximum number of shares issuable     1,550,000       2,250,000   975,000  
Expiration period         5 years 10 years        
Percentage of total number of shares for which options granted under the plan generally become exercisable at the end of each 12-month period       25.00%            
Options outstanding (in shares) 493,888 638,521   220,000       30,000   243,888
Amount of limitation on deductibility under Section 162(m) of Internal Revenue Code (in dollars)             $ 1,000,000      
Number of types of equity awards             2      
Shares of common stock issued since inception             1,024,143   3,682  
Additional shares reserved             108,866      
Options granted since inception (in shares)               60,000    
Shares or options available for future issuance             1,068,241   209,784