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Stock Based Awards - Stock Options Outstanding and Exercisable under Stock Option Plans (Detail)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number 1,820,160
Options Exercisable and Vested, Outstanding Number 1,474,782
$0.06 - $0.06 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 0.06
Range of Exercise Price, Upper Limit | $ / shares $ 0.06
Options Outstanding, Number 86,867
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 1 year 6 months
Options Exercisable and Vested, Outstanding Number 86,867
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 1 year 6 months
$0.24-$0.24 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 0.24
Range of Exercise Price, Upper Limit | $ / shares $ 0.24
Options Outstanding, Number 621,098
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 4 months 24 days
Options Exercisable and Vested, Outstanding Number 621,098
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 5 years 4 months 24 days
$0.66-$0.90 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 0.66
Range of Exercise Price, Upper Limit | $ / shares $ 0.90
Options Outstanding, Number 451,632
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 7 years 9 months 18 days
Options Exercisable and Vested, Outstanding Number 451,632
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 7 years 9 months 18 days
$3.54-$5.83 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 3.54
Range of Exercise Price, Upper Limit | $ / shares $ 5.83
Options Outstanding, Number 385,673
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 8 years 9 months 18 days
Options Exercisable and Vested, Outstanding Number 110,828
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 8 years 9 months 18 days
$5.87-$191.76 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 5.87
Range of Exercise Price, Upper Limit | $ / shares $ 191.76
Options Outstanding, Number 274,890
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 9 months 18 days
Options Exercisable and Vested, Outstanding Number 204,357
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 5 years 9 months 18 days