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Mortgage and Loans Payable - Senior Convertible Notes - Initial Note - Additional Information (Detail)
 1 Months Ended 9 Months Ended
Nov. 30, 2011
USD ($)
Investor
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
Sep. 30, 2014
$ / shares
Dec. 31, 2013
USD ($)
shares
May. 10, 2012
USD ($)
$ / shares
Debt Instrument [Line Items]            
Original principal amount           $ 8,000,000
Warrants issued to purchase common stock | shares   1,302,083        
Debt instrument conversion price, percentage   125.00%        
Acceleration payment of remaining face value, percentage   125.00%        
Adjusted conversion price of quoted market prices, Percentage   75.00%        
Common stock initial exercise price | $ / shares   $ 4.32        
Common stock issued under warrant terms | shares   434,027        
Period to exercise warrants   5 years        
Warrants exercise price per share | $ / shares   $ 3.60   $ 3.60   $ 3.60
Registration statement filing period   6 months        
Period for registration statement to be effective   90 days thereafter        
Registration statement review period   120 days thereafter        
Senior Convertible Notes [Member]            
Debt Instrument [Line Items]            
Original principal amount $ 10,000,000          
Warrants issued to purchase common stock | shares 1,302,083          
Original principal amount of repurchased note $ 5,000,000          
Debt related expenses   $ 545,000        
Number of institutional investors under securities purchase agreement | Investor 1          
Indebtedness, interest rate per year   8.00%        
Indebtedness, interest rate per year under default condition   15.00%        
Original principal installments   $ 434,783        
Note repayment commencing date   Jul. 08, 2012        
Debt instrument conversion, reset conversion price description   The reset conversion price applicable to the Initial Note was to be adjusted to the lesser of (a) the then current conversion price and (b) the greater of (i) $1.44 and (ii) 110.0% of the market price of our common stock on the six-month anniversary of the initial closing date (as applicable, the "Conversion Price").        
Debt instrument conversion price | $ / shares   $ 1.44        
Debt instrument conversion price, percentage   110.00%        
Initial conversion price | $ / shares   $ 3.74       $ 3.17
Debt instrument, amortization payment description   The conversion rate applicable to any amortization payment that were made in shares of our common stock was the lower of (a) the Conversion Price and (b) a price equal to 85.0% of the average for a ten-day period immediately prior to the applicable amortization date of the volume-weighted average price of our shares of common stock.        
Volume-weighted average price, percentage   85.00%        
Conversion price applicable period   10 days        
Common shares issued as payment in outstanding principal | shares         3,282,934  
Principal amount outstanding         $ 8,608,694  
Principal payment     $ 1,391,306      
Lender [Member] | Senior Convertible Notes [Member]            
Debt Instrument [Line Items]            
Debt related expenses   $ 45,000