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Equity - Options, Additional Information (Detail)
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options, Granted 2,052,500
Weighted Average Exercise Price, Granted | $ / shares $ 0.58
Expiration 1,565,000
2010 Stock Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares reserved for issuance 11,700,000
2010 Stock Plan | Employee Stock Option  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares reserved for issuance 11,700,000
Remaining shares available for future equity awards 3,727,283
Number of Options, Granted 14,429,757
Forfeited 1,550,000
Expiration 15,000
Add back: options used in net exercise 192,385