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Preferred Stock and Warrant - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 1 Months Ended 6 Months Ended 6 Months Ended
Mar. 26, 2013
Apr. 18, 2011
Jun. 30, 2012
Jun. 30, 2013
Dec. 31, 2012
Jun. 18, 2012
Jun. 15, 2012
Jun. 30, 2013
Maximum [Member]
Jun. 30, 2013
Warrant [Member]
Jun. 30, 2013
Series A Cumulative Redeemable Preferred Stock [Member]
Dec. 31, 2012
Series A Cumulative Redeemable Preferred Stock [Member]
Apr. 18, 2011
Series A Cumulative Redeemable Preferred Stock [Member]
Preferred Units [Line Items]                        
Gross proceeds from Securities Purchase Agreement   $ 25.0                    
Preferred stock, shares issued   25,000   0 0         12,458 14,228  
Warrant purchase common stock   1,900,000   1,900,000       1,900,000        
Preferred stock, par value   $ 0.01   $ 0.01 $ 0.01         $ 0.01 $ 0.01 $ 0.01
Preferred stock pursuant to Articles Supplementary                       27,650
Preferred Stock liquidation preference pursuant to Articles Supplementary                       $ 1,000
Preferred Stock cash dividend of liquidation preference                       10.00%
Preferred Stock dividend of liquidation preference on additional shares                       2.00%
Preference share, aggregate redemption price 2.1           12.3          
Preference Stock, shares agreed for redemption 1,902         11,514 11,514          
Prepayment fee 0.2   0.8                  
Amortization of issuance costs 0.1   0.7                  
Preferred stock, shares outstanding       0 0         12,458 14,228  
Expiry date of Warrant       Oct. 18, 2016                
Common stock exercise price       2.08         2.25      
Fair value of Warrant       $ 1.6                
Risk-free interest rate, fair value assumptions                 2.26%      
Dividend yield, fair value assumptions                 5.00%      
Expected volatility, fair value assumptions                 60.00%      
Expected term, fair value assumptions                 5 years 6 months