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Stock-Based Compensation - Summary of Information Regarding the Company's Outstanding and Exercisable Stock Options (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	1,721,000	1,111,000	674,000	890,000
Weighted Average Remaining Contractual Life (in years)	7 years 10 months 24 days
Weighted Average Exercise Price	$ 5.52	$ 4.95	$ 3.43	$ 2.80
Options Exercisable	435,000
Weighted average remaining contractual life, options exercisable	6 years 8 months 12 days
Weighted average exercise price, options exercisable	$ 4.25
Range One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	610,000
Lower range of exercise price	$ 2.01
Upper range of exercise price	$ 4.00
Weighted Average Remaining Contractual Life (in years)	6 years 2 months 12 days
Weighted Average Exercise Price	$ 3.55
Options Exercisable	343,000
Range of exercise prices, minimum, options exercisable	$ 2.01
Range of exercise price, maximum, options exercisable	$ 4.00
Weighted average remaining contractual life, options exercisable	6 years 2 months 12 days
Weighted average exercise price, options exercisable	$ 3.58
Range Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	130,000
Lower range of exercise price	$ 4.01
Upper range of exercise price	$ 6.00
Weighted Average Remaining Contractual Life (in years)	9 years 7 months 6 days
Weighted Average Exercise Price	$ 5.65
Options Exercisable	0
Range of exercise prices, minimum, options exercisable	$ 4.01
Range of exercise price, maximum, options exercisable	$ 6.00
Weighted average remaining contractual life, options exercisable	0 years
Weighted average exercise price, options exercisable	$ 0
Range Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding	981,000
Lower range of exercise price	$ 6.01
Upper range of exercise price	$ 8.00
Weighted Average Remaining Contractual Life (in years)	8 years 8 months 12 days
Weighted Average Exercise Price	$ 6.72
Options Exercisable	92,000
Range of exercise prices, minimum, options exercisable	$ 6.01
Range of exercise price, maximum, options exercisable	$ 8.00
Weighted average remaining contractual life, options exercisable	8 years 3 months 18 days
Weighted average exercise price, options exercisable	$ 6.75

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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-Publisher FASB
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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