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Summary of Activity for Stock Option Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Stock Options Number Outstanding
Beginning Balance	562,102
Ending Balance	562,102	562,102
Vested or expected to vest as of March 31, 2020	562,102
Exercisable as of March 31, 2020	562,102
Stock Options Average Exercise Price per share
Beginning Balance	$ 5.60
Ending Balance	5.60	$ 5.60
Vested or expected to vest as of March 31, 2020	5.60
Exercisable as of March 31, 2020	$ 5.60
Stock Options Remaining Contractual Life (in years)
Weighted Average Remaining Contractual Term (Years)	5 years 6 months 21 days	5 years 10 months 9 days
Vested or expected to vest as of March 31, 2020	5 years 6 months 21 days
Exercisable as of March 31, 2020	5 years 6 months 21 days
Stock Options Average Intrinsic Value
Average intrinsic value		$ 572,869

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Share based compensation arrangement by share based payment award options aggregate intrinsic value.

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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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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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