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Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected Quarterly Financial Information [Abstract]                      
Revenues $ 9,121 $ 8,569 $ 8,358 $ 13,491 $ 14,952 $ 12,417 $ 10,385 $ 8,116 $ 39,539 $ 45,870 $ 24,133
Expenses 24,794 21,254 20,635 19,712 19,421 20,071 17,432 15,727 86,395 72,651 50,839
Net loss $ (14,013) $ (9,245) $ (12,126) $ (5,319) $ (4,319) $ (7,545) $ (6,981) $ (7,572) $ (40,703) $ (26,417) $ (26,624)
Net loss per share $ (0.20) $ (0.13) $ (0.17) $ (0.08) $ (0.06) $ (0.11) $ (0.10) $ (0.12) $ (0.58) $ (0.39) $ (0.48)