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Stock-Based Compensation - Additional Information (Detail) - 2007 Plan [Member] $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost for restricted stock units granted | $	$ 1.9
Cost expected to be recognized over a weighted-average period	2 years 10 months 24 days
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units and restricted stock awards, vest, period	1 year
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units and restricted stock awards, vest, period	5 years
Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized | shares	7,500,000

X

- Definition

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

+ References

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