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Net Income (Loss) Per Share - Schedule of Earnings Per Share, Basic and Diluted (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                            
Net income (loss) $ (8,404) $ (5,516) $ (6,929) $ 5,389 $ (16,493) $ (19,678) $ (18,026) $ (15,660) $ (10,537) $ (20,122) $ (11,104) $ (23,549) $ (63,902) $ (36,606)
Denominator:                            
Weighted average number of common shares outstanding 37,421,273     9,101,730           31,944,243 9,035,173      
Effect of dilutive securities                            
Stock options 0     33,864           0 0      
Warrants 0     138,273           0 0      
Dilutive potential common shares 0     172,137           0 0      
Weighted Average Number of Shares Outstanding, Diluted 37,421,273     9,273,867           31,944,243 9,035,173      
Earnings Per Share, Basic $ (0.22) $ (0.51) $ (0.66) $ 0.59 $ (1.84) $ (2.51) $ (2.23) $ (1.94) $ (1.55) $ (0.63) $ (0.30)      
Earnings Per Share, Diluted $ (0.22)     $ 0.58           $ (0.63) $ (0.30)