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Stock Based Awards - Stock Options Outstanding and Exercisable under Stock Option Plans (Detail)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Number 1,515,923
Options Exercisable and Vested, Outstanding Number 1,469,854
$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) 2 years 6 months
Options Exercisable and Vested, Outstanding Number 86,867
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 2 years 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) 6 years 4 months 24 days
Options Exercisable and Vested, Outstanding Number 621,098
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 6 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 475,985
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 8 years 6 months
Options Exercisable and Vested, Outstanding Number 475,985
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 8 years 6 months
$7.59-$126.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 7.59
Range of Exercise Price, Upper Limit | $ / shares $ 126.00
Options Outstanding, Number 312,679
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 1 month 6 days
Options Exercisable and Vested, Outstanding Number 266,644
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 5 years 1 month 6 days
$127.80-$191.76 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Price, Lower Limit | $ / shares $ 127.80
Range of Exercise Price, Upper Limit | $ / shares $ 191.76
Options Outstanding, Number 19,294
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 9 months 18 days
Options Exercisable and Vested, Outstanding Number 19,260
Options Exercisable and Vested, Weighted Average Remaining Contractual Life (Years) 3 years 9 months 18 days