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Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 4,787 | $ 4,512 |  | $ 4,041 |  | $ 4,086 |  | $ 3,990 |  | $ 3,272 |  | $ 3,222 |  | $ 2,174 |  |  |  | $ 14,175 | $ 12,117 | $ 16,629 | $ 8,668 | $ 5
Net income (loss) | 302 | 49 |  | (14) |  | 239 |  | 153 |  | (53) |  | (65) |  | (189) |  | (63) |  | 966 | 378 | 427 | (370) | 4
Net income (loss) allocable to common shares | $ 255 | $ (55) |  | $ (28) |  | $ (14) |  | $ (26) |  | $ (28) |  | $ (48) |  | $ 27 |  | $ (63) |  | $ 307 | $ (68) | $ (123) | $ (112) | $ 4
Total earnings (loss) per share-Basic | $ 0.03 | $ (0.19) | [1] | $ (0.09) | [1] | $ (0.04) | [1] | $ (0.21) | [1] | $ (1.40) | [1] | $ (2.40) | [1] | $ 1.35 | [1] | $ (3.16) | [1] | $ 0.08 | $ (0.26) | $ (0.45) | $ (5.60) | $ 0.20
Total earnings (loss) per share-Diluted | $ 0.03 | $ (0.19) | [1] | $ (0.09) | [1] | $ (0.04) | [1] | $ (0.21) | [1] | $ (1.40) | [1] | $ (2.40) | [1] | $ 1.35 | [1] | $ (3.16) | [1] | $ 0.08 | $ (0.26) | $ (0.45) | $ (5.60) | $ 0.20
[1] | The summation of quarterly per share amounts do not equal the full year amounts.

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