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Quarterly Financial Data (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Information [Line Items]                      
Total revenue $ 16,362us-gaap_Revenues $ 13,057us-gaap_Revenues $ 11,649us-gaap_Revenues $ 8,135us-gaap_Revenues $ 5,768us-gaap_Revenues $ 4,787us-gaap_Revenues $ 4,700us-gaap_Revenues $ 4,688us-gaap_Revenues $ 49,203us-gaap_Revenues $ 19,943us-gaap_Revenues $ 16,629us-gaap_Revenues
Net income (loss) 195us-gaap_ProfitLoss (58)us-gaap_ProfitLoss (128)us-gaap_ProfitLoss 2,935us-gaap_ProfitLoss 308us-gaap_ProfitLoss 302us-gaap_ProfitLoss 324us-gaap_ProfitLoss 340us-gaap_ProfitLoss 2,944us-gaap_ProfitLoss 1,274us-gaap_ProfitLoss 427us-gaap_ProfitLoss
Net income (loss) allocable to common shares $ 189us-gaap_NetIncomeLoss $ (56)us-gaap_NetIncomeLoss $ (128)us-gaap_NetIncomeLoss $ 2,935us-gaap_NetIncomeLoss $ 308us-gaap_NetIncomeLoss $ 255us-gaap_NetIncomeLoss $ 48us-gaap_NetIncomeLoss $ 4us-gaap_NetIncomeLoss $ 2,940us-gaap_NetIncomeLoss $ 615us-gaap_NetIncomeLoss $ (123)us-gaap_NetIncomeLoss
Total earnings (loss) per share-Basic $ 0.01us-gaap_EarningsPerShareBasic [1] $ 0.00us-gaap_EarningsPerShareBasic [1] $ (0.01)us-gaap_EarningsPerShareBasic [1] $ 0.19us-gaap_EarningsPerShareBasic [1] $ 0.03us-gaap_EarningsPerShareBasic [1] $ 0.03us-gaap_EarningsPerShareBasic [1] $ 0.01us-gaap_EarningsPerShareBasic [1] $ 0.01us-gaap_EarningsPerShareBasic [1] $ 0.14us-gaap_EarningsPerShareBasic $ 0.12us-gaap_EarningsPerShareBasic $ (0.45)us-gaap_EarningsPerShareBasic
Total earnings (loss) per share-Diluted $ 0.01us-gaap_EarningsPerShareDiluted [1] $ 0.00us-gaap_EarningsPerShareDiluted [1] $ (0.01)us-gaap_EarningsPerShareDiluted [1] $ 0.19us-gaap_EarningsPerShareDiluted [1] $ 0.03us-gaap_EarningsPerShareDiluted [1] $ 0.03us-gaap_EarningsPerShareDiluted [1] $ 0.01us-gaap_EarningsPerShareDiluted [1] $ 0.00us-gaap_EarningsPerShareDiluted [1] $ 0.14us-gaap_EarningsPerShareDiluted $ 0.12us-gaap_EarningsPerShareDiluted $ (0.45)us-gaap_EarningsPerShareDiluted
[1] The summation of quarterly per share amounts do not equal the full year amounts.