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Equity - Summary of Stock Options Outstanding and Exercisable (Detail) - Employee Stock Option
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Options Outstanding | shares 5,375,000
Weighted Average Exercise Price $ 1.18
Weighted Average Remaining Contractual Lives 6 years 21 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 4,747,000
Weighted Average Exercise Price $ 0.74
Weighted Average Remaining Contractual Lives 6 years 5 months 15 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 440,000
Weighted Average Exercise Price $ 3.05
Weighted Average Remaining Contractual Lives 2 years 11 months 4 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 4 months 6 days
Range of Exercise Prices Lower $ 5.01
Range of Exercise Prices Upper $ 8.62