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Mortgage and Loans Payable - Senior Convertible Notes - Initial Note - Additional Information (Detail) | 1 Months Ended | 9 Months Ended |  |  |  |
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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 |  |  |  |

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