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Earnings (Loss) per share - Schedule of Antidilutive Securities Excluded from Computation of Earnings (Loss) per Share (Detail) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities 6,510,779 18,969,950 9,425,696 18,969,950
Restricted Stock Units [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities 3,750,003 16,529,848 6,664,920 16,529,848
Warrants [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities 2,623,776 2,220,102 2,623,776 2,220,102
Stock Options [Member]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Anti-dilutive securities 137,000 220,000 137,000 220,000