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Quarterly Financial Data - Summary of Quarterly Results (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 Financial Information Disclosure [Abstract]                      
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      
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         $ 0.22us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.43)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.58)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ (0.53)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare      
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              
Net income (loss) per share allocable to common stockholders - diluted         $ 0.21us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.43)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.58)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ (0.53)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare