Quarterly report pursuant to Section 13 or 15(d)

Preferred Stock - Additional Information (Detail)

v2.4.0.8
Preferred Stock - Additional Information (Detail) (USD $)
 0 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2014
Sep. 30, 2014
Dec. 31, 2013
Preferred Stock [Line Items]      
Preferred stock authorized to issue   5,000,000  
Accrual of dividends on convertible preferred stock   $ 1,449,000  
Series C Convertible Preferred Stock
      
Preferred Stock [Line Items]      
Preferred stock authorized to issue   25,000 25,000
Preferred stock, cumulative dividends rate   10.00%  
Preferred stock, stated value for cumulative dividends   $ 1,000  
Preferred stock, dividends accrued   758,000 1,014,000
Series E Convertible Preferred Stock
      
Preferred Stock [Line Items]      
Preferred stock, cumulative dividends rate   5.00%  
Accrual of dividends on convertible preferred stock   190,000 218,000
Series F Convertible Preferred Stock
      
Preferred Stock [Line Items]      
Preferred stock, cumulative dividends rate   7.00%  
Accrual of dividends on convertible preferred stock   175,000 129,000
Exchange agreement, shares received 5,000    
Series G Redeemable Convertible Preferred Stock
      
Preferred Stock [Line Items]      
Preferred stock, cumulative dividends rate   9.00%  
Accrual of dividends on convertible preferred stock   326,000 0
Convertible redeemable preferred stock, shares authorized   18,000  
Convertible redeemable preferred stock, par value   $ 0.001  
Convertible stock, Conversion of preferred stock 5,404    
Conversion price   $ 2.30  
Temporary equity liquidation preference per share   $ 1,000  
Redemption price added to liquidation Preference per share   900,000  
Market value of preferred stock exchanged   18,400,000  
Charge recorded in additional paid capital for difference between fair value and stated value   400,000  
Series G Redeemable Convertible Preferred Stock | Dated April 17, 2014
      
Preferred Stock [Line Items]      
Debt exchanged with stock, shares 10,956,000    
Debt exchanged with stock, amount 10,956    
Series G Redeemable Convertible Preferred Stock | Dated February 25, 2014
      
Preferred Stock [Line Items]      
Debt exchanged with stock, shares 1,640    
Debt exchanged with stock, amount $ 1,640,085