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Stock-Based Compensation Arrangements - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Aug. 07, 2012
Subsequent Event
Jun. 30, 2012
2004 Employee, Director and Consultant Stock Plan
Jun. 30, 2012
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares of common stock available for grant         2,258,213  
Stock purchase price   85.00%        
Employee stock purchase plan, shares authorized 500,000 500,000   750,000    
Shares reserved for issuance 5,631 5,631        
Number of shares purchased by employees 5,628 52,158 64,134      
Weighted-average purchase price   $ 0.17 $ 0.26      
Weighted-average fair value   $ 0.20 $ 0.31      
Compensation expense   $ 1,332 $ 2,855      
Unrecognized compensation cost           $ 217,000