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Series C Convertible Preferred Stock - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Mar. 31, 2011 Series C Preferred Stock | Dec. 31, 2013 Series C Preferred Stock Installment
Preferred Stock [Line Items] |  |  |
Preferred shares issued |  | 7,000 |
Initial stated value per preferred share |  | $ 10,000 |
Proceeds from the sale of Series C Convertible Preferred Stock | $ 61,403,000 | $ 64,013,000 |
Agent fees and offering costs |  | 5,987,000 |
Percentage of dividend payable |  |  | 8.00%
Number of equal quarterly installments |  |  | 9
Installments start date |  |  | Sep. 01, 2011
Installments end date |  |  | Sep. 01, 2013
Preferred share plus accumulated and unpaid dividends |  |  | $ 10,000
Conversion price of convertible preference stock |  |  | $ 15.83
Stock issued upon conversion of preferred stock (in shares) |  |  | 954,000

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