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Net Income (Loss) Per Share - Common Shares Excluded from Net Loss (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Shares of common stock issuable upon the exercise which were excluded from the computation of diluted earnings per share 20,062 1,398 20,062 2,386 3,131 1,778
Warrants to purchase common stock            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Shares of common stock issuable upon the exercise which were excluded from the computation of diluted earnings per share 19,557 1,076 19,557 1,871 2,570 1,115
Options to purchase common stock            
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]            
Shares of common stock issuable upon the exercise which were excluded from the computation of diluted earnings per share 505 322 505 515 561 663