Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Additional Information (Detail)

v2.4.0.8
Common Stock - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, shares authorized 50,000,000   50,000,000
Common stock, par value $ 0.001   $ 0.001
Preferred stock, shares authorized 5,000,000    
Preferred stock, par value $ 0.001    
Number of Optioned Common Shares, Option exercises 10,000 3,100  
Restricted stock unit settlements 35,309 10,004  
Unrecognized compensation expense related to stock options granted $ 4.2   $ 2.7
Effect on diluted per share on shares underlying options, restricted stock units and warrants 3,400,000   3,000,000
Warrants outstanding 1,587,301    
Exercise price warrants $ 20    
Warrants expiration date 2015-10    
Number of warrants exercised 0 0  
2010 Performance incentive plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares available for future option grants 521,311    
Stock options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average period, restricted stock awards 2 years 10 months 24 days    
Stock options [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period 7 years    
Stock options [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period 10 years    
Stock options [Member] | Employees and consultants [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Stock options [Member] | Board of Directors [Member] | Minimum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Stock options [Member] | Board of Directors [Member] | Maximum [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Stock options [Member] | 2010 Performance incentive plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for issuance under various plans 2,335,548    
Common shares reserved for options currently outstanding 1,257,088    
Restricted stock unit awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for awards currently outstanding 557,149   356,589
Award vesting period 4 years    
Weighted-average period, restricted stock awards 3 years 2 months 12 days    
Stock based compensation expense 0.5 0.3  
Total unrecognized compensation expense related to the Company's restricted stock unit awards $ 5.0    
Restricted stock unit awards [Member] | 2010 Performance incentive plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for awards currently outstanding 557,149