v2.4.1.9

Selected Quarterly Financial Data - Summary of Selected Quarterly Financial Data (Detail) (USD $) In Thousands, except 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 Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 7,952us-gaap_Revenues | $ 6,654us-gaap_Revenues | $ 6,776us-gaap_Revenues | $ 5,924us-gaap_Revenues | $ 5,855us-gaap_Revenues | $ 5,805us-gaap_Revenues | $ 5,457us-gaap_Revenues | $ 4,981us-gaap_Revenues | $ 27,306us-gaap_Revenues | $ 22,098us-gaap_Revenues | $ 20,451us-gaap_Revenues
Net income (loss) | $ (5)us-gaap_NetIncomeLoss | $ 1,213us-gaap_NetIncomeLoss | $ 877us-gaap_NetIncomeLoss | $ (1,304)us-gaap_NetIncomeLoss | $ (562)us-gaap_NetIncomeLoss | $ (830)us-gaap_NetIncomeLoss | $ (802)us-gaap_NetIncomeLoss | $ (1,348)us-gaap_NetIncomeLoss | $ 781us-gaap_NetIncomeLoss | $ (3,542)us-gaap_NetIncomeLoss | $ (5,059)us-gaap_NetIncomeLoss
Net income (loss) per common share, basic | $ 0.00us-gaap_EarningsPerShareBasic | $ 0.13us-gaap_EarningsPerShareBasic | $ 0.87us-gaap_EarningsPerShareBasic | $ (1.29)us-gaap_EarningsPerShareBasic |  |  |  |  | $ 0.13us-gaap_EarningsPerShareBasic | $ (3.50)us-gaap_EarningsPerShareBasic | $ (5.01)us-gaap_EarningsPerShareBasic
Net loss per common share, basic and diluted |  |  |  |  | $ (0.56)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.82)us-gaap_EarningsPerShareBasicAndDiluted | $ (0.79)us-gaap_EarningsPerShareBasicAndDiluted | $ (1.33)us-gaap_EarningsPerShareBasicAndDiluted |  |  |
Net income (loss) per common share, diluted | $ 0.00us-gaap_EarningsPerShareDiluted | $ 0.12us-gaap_EarningsPerShareDiluted | $ 0.13us-gaap_EarningsPerShareDiluted | $ (1.29)us-gaap_EarningsPerShareDiluted |  |  |  |  | $ 0.10us-gaap_EarningsPerShareDiluted | $ (3.50)us-gaap_EarningsPerShareDiluted | $ (5.01)us-gaap_EarningsPerShareDiluted
Shares used in calculation of net loss per share, basic and diluted |  |  |  |  | 1,011,136us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 1,011,136us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 1,011,123us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted | 1,010,684us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted |  |  |
Shares used in calculation of net income (loss) per share, basic | 11,802,241us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 9,279,649us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 1,013,128us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 1,011,980us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  |  |  |  | 5,815,928us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 1,010,795us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 1,009,236us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Shares used in calculation of net income (loss) per share, diluted | 11,802,241us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 11,219,377us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 6,939,568us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 1,011,980us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  |  |  |  | 9,283,001us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 1,010,795us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 1,009,236us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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