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Equity - Summary of Stock Options Outstanding and Exercisable (Detail) - Employee Stock Option
3 Months Ended
Mar. 31, 2020
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding | shares 6,240,000
Weighted Average Exercise Price $ 1.29
Weighted Average Remaining Contractual Lives 5 years 5 months 12 days
$0.40 - $2.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding | shares 5,212,000
Weighted Average Exercise Price $ 0.73
Weighted Average Remaining Contractual Lives 6 years 1 month 17 days
Range of Exercise Prices Lower $ 0.40
Range of Exercise Prices Upper $ 2.00
$2.01 - $5.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding | shares 840,000
Weighted Average Exercise Price $ 3.28
Weighted Average Remaining Contractual Lives 1 year 8 months 5 days
Range of Exercise Prices Lower $ 2.01
Range of Exercise Prices Upper $ 5.00
$5.01 - $8.93 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding | shares 188,000
Weighted Average Exercise Price $ 7.97
Weighted Average Remaining Contractual Lives 3 years 7 months 6 days
Range of Exercise Prices Lower $ 5.01
Range of Exercise Prices Upper $ 8.62