Quarterly Financial Data - Summary of Quarterly Results (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified
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3 Months Ended |
12 Months Ended |
Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Quarterly Financial Information Disclosure [Abstract] |
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Total revenues |
$ 21,758us-gaap_SalesRevenueNet |
$ 9,415us-gaap_SalesRevenueNet |
$ 7,788us-gaap_SalesRevenueNet |
$ 7,979us-gaap_SalesRevenueNet |
$ 24,349us-gaap_SalesRevenueNet |
$ 4,469us-gaap_SalesRevenueNet |
$ 1,009us-gaap_SalesRevenueNet |
$ 821us-gaap_SalesRevenueNet |
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Net income (loss) |
8,443us-gaap_NetIncomeLoss |
(5,971)us-gaap_NetIncomeLoss |
(8,374)us-gaap_NetIncomeLoss |
(8,744)us-gaap_NetIncomeLoss |
6,531us-gaap_NetIncomeLoss |
(12,588)us-gaap_NetIncomeLoss |
(15,041)us-gaap_NetIncomeLoss |
(12,619)us-gaap_NetIncomeLoss |
(14,646)us-gaap_NetIncomeLoss |
(33,717)us-gaap_NetIncomeLoss |
(40,370)us-gaap_NetIncomeLoss |
Net income (loss) allocable to common stockholders |
$ 8,443us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
$ (5,971)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
$ (8,374)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
$ (8,744)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
$ 6,531us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
$ (12,588)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
$ (15,041)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
$ (12,619)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
$ (14,646)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
$ (33,717)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
$ (41,677)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Net income (loss) per share allocable to common stockholders - basic |
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$ 0.22us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
$ (0.43)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
$ (0.58)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
$ (0.53)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
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Net income (loss) per share allocable to common stockholders - basic and diluted |
$ 0.23us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare |
$ (0.16)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare |
$ (0.23)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare |
$ (0.27)us-gaap_IncomeLossFromContinuingOperationsPerBasicAndDilutedShare |
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Net income (loss) per share allocable to common stockholders - diluted |
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$ 0.21us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
$ (0.43)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
$ (0.58)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
$ (0.53)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
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