Equity Incentive Plan - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option exercised	0	0
Stock-based compensation	$ 2,265	$ 2,125
Stock issued during period value	$ 3,500
Restricted stock units, Description	market value equal to the greater of (1) $3.5 million or (2) an amount determined using a formula-based model (as defined in the respective employment agreements), as of the date of such grants.
Non Employee Director [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 700	$ 600
Stock award, Granted	7,223	6,500
Performance Based Vesting Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period	10 years
Weighted average fair value granted	$ 37.16	$ 41.20
Stock option outstanding	0
Performance Based Vesting Stock Option [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Internal rate of return on investment	70.00%
2019 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock options authorized under plan	7,500,000
Common stock options available for issuance	6,985,290
Stock award, Granted	514,710
Stock issued during period shares	0
2019 Plan [Member] \| Time Based Vesting Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Expiration period	10 years
Weighted average fair value granted	$ 1.89
Stock-based compensation	$ 10
Unrecognized stock-based compensation expense	$ 1,000
Unrecognized stock-based compensation expense, period	3 years
2016 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation expense	$ 0
Stock award, Granted	67,050	84,270
2016 Plan [Member] \| Time Based Vesting Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	5 years
Expiration period	10 years
Weighted average fair value granted	$ 37.16	$ 41.20
Stock-based compensation	$ 2,300	$ 1,500

Percentage of internal rate of return on investment .

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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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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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Gross number of share options (or share units) granted during the period.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Aggregate value of stock related to Restricted Stock Awards issued during the period.

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