Stock-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Options [Member]	6 Months Ended
	Jun. 30, 2021 $ / shares shares
Summary Of Stock Option Activities [Line Items]
Options Outstanding, Beginning balance, Shares | shares	16,250
Options Outstanding, Exercised | shares	(6,000)
Options Outstanding, Cancelled/expired | shares	(6,250)
Options Outstanding, Ending balance, Shares | shares	4,000
Options Exercisable, Ending balance, Shares | shares	3,664
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 6.54
Weighted Average Exercise Price, Exercised | $ / shares	5.48
Weighted Average Exercise Price, Options cancelled/expired | $ / shares	7.89
Weighted Average Exercise Price, Ending balance | $ / shares	6.02
Weighted Average Exercise Price, Ending balance | $ / shares	$ 5.93