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Series C Convertible Preferred Stock - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |
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Dec. 31, 2011 | Mar. 31, 2011 Series C Convertible Preferred Stock | Dec. 31, 2012 Series C Convertible Preferred Stock Installment | Dec. 31, 2012 Series C Convertible Preferred Stock [Member] | Mar. 06, 2011 Series C Convertible Preferred Stock [Member] | Mar. 03, 2011 Series C Convertible Preferred Stock [Member]
Preferred Stock [Line Items] |  |  |  |  |  |
Preferred shares issued |  | 7,000 |  |  |  |
Initial stated value per preferred share |  | $ 10,000 |  |  |  |
Net proceeds from sale of shares | $ 61,403,000 | $ 64,013,000 |  |  |  |
Agent fees and offering costs |  | 5,987,000 |  |  |  |
Redemption price premium percentage |  |  |  | 102.50% |  |
Fair value of redemption premium |  |  |  |  |  | 700,000
Fair value of warrants |  |  |  |  | 0 | 1,910,000
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 |  |  |
Market price discount |  |  |  | 10.00% |  |
Conversion price of convertible preference stock |  |  |  | $ 15.83 |  |
Preferred stock redemption rate |  |  |  | 125.00% |  |
Maximum indetedness under credit facility |  |  |  | $ 150,000,000 |  |

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