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Stock-Based Compensation Plans - Summary of Performance Unit Awards (Detail) - Performance Unit Awards
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Number of Units  
Outstanding, beginning balance | shares 6,851,542
Granted | shares 3,830,000
Vested | shares (2,052,959)
Forfeited | shares (10,000)
Outstanding, ending balance | shares 8,618,583
Weighted Average Grant Date Fair Value  
Outstanding, beginning balance (in USD per share) | $ / shares $ 0.81
Granted (in USD per share) | $ / shares 0.83
Vested (in USD per share) | $ / shares 0.95
Forfeited (in USD per share) | $ / shares 0.92
Outstanding, ending balance (in USD per share) | $ / shares $ 0.79