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Summary of Additional Information Regarding Outstanding and Exercisable Options under Stock Based Compensation Plans (Detail)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Options Outstanding, Number of Shares | shares 3,000,256
Options Outstanding, Weighted Average Remaining Contractual Life 6 years 2 months 19 days
Options Outstanding, Weighted Average Exercise Price $ 4.88
Options Exercisable, Number of Shares | shares 2,592,756
Options Exercisable, Weighted Average Exercise Price $ 4.90
$0.87-$1.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price 0.87
Maximum Exercise Price $ 1.00
Options Outstanding, Number of Shares | shares 190,500
Options Outstanding, Weighted Average Remaining Contractual Life 6 years 11 months 12 days
Options Outstanding, Weighted Average Exercise Price $ 0.88
Options Exercisable, Number of Shares | shares 190,500
Options Exercisable, Weighted Average Exercise Price $ 0.88
$1.01-$3.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price 1.01
Maximum Exercise Price $ 3.00
Options Outstanding, Number of Shares | shares 677,103
Options Outstanding, Weighted Average Remaining Contractual Life 6 years 7 days
Options Outstanding, Weighted Average Exercise Price $ 2.37
Options Exercisable, Number of Shares | shares 677,103
Options Exercisable, Weighted Average Exercise Price $ 2.37
$3.01-$5.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price 3.01
Maximum Exercise Price $ 5.00
Options Outstanding, Number of Shares | shares 1,071,678
Options Outstanding, Weighted Average Remaining Contractual Life 8 years 2 months 8 days
Options Outstanding, Weighted Average Exercise Price $ 4.36
Options Exercisable, Number of Shares | shares 664,178
Options Exercisable, Weighted Average Exercise Price $ 4.13
$5.01 - $8.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price 5.01
Maximum Exercise Price $ 8.00
Options Outstanding, Number of Shares | shares 878,475
Options Outstanding, Weighted Average Remaining Contractual Life 4 years 3 months 7 days
Options Outstanding, Weighted Average Exercise Price $ 6.55
Options Exercisable, Number of Shares | shares 878,475
Options Exercisable, Weighted Average Exercise Price $ 6.55
$8.01-$13.38  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Minimum Exercise Price 8.01
Maximum Exercise Price $ 13.38
Options Outstanding, Number of Shares | shares 182,500
Options Outstanding, Weighted Average Remaining Contractual Life 4 years 21 days
Options Outstanding, Weighted Average Exercise Price $ 13.38
Options Exercisable, Number of Shares | shares 182,500
Options Exercisable, Weighted Average Exercise Price $ 13.38