Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data - Schedule of Quarterly Financial Information (Detail)

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Quarterly Financial Data - Schedule of Quarterly Financial Information (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
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 65,874 $ 3,680 $ 3,680 $ 3,681 $ 3,681 $ 3,680 $ 3,680 $ 3,681 $ 76,915 $ 14,722 $ 12,495
Net income (loss) $ 69,713 $ (6,431) $ (8,306) $ (11,154) $ (5,964) $ (7,745) $ (766) $ (7,109) $ 43,822 $ (21,584) $ (28,415)
Net income (loss) per common share                      
Basic $ 0.98 $ (0.09) $ (0.12) $ (0.17) $ (0.09) $ (0.13) $ (0.01) $ (0.12) $ 0.62 $ (0.36) $ (0.49)
Diluted $ 0.86 $ (0.09) $ (0.12) $ (0.17) $ (0.12) $ (0.15) $ (0.12) $ (0.14) $ 0.54 $ (0.49) $ (0.49)