Stock-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Options [Member]	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Summary Of Stock Option Activities [Line Items]
Options Outstanding, Beginning balance, Shares | shares	150,246
Options Outstanding, Exercised | shares	(61,767)
Options Outstanding, Forfeited | shares	(188)
Options Outstanding, Cancelled/expired | shares	(72,041)
Options Outstanding, Ending balance, Shares | shares	16,250
Options Exercisable, Ending balance, Shares | shares	15,431
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 7.11
Weighted Average Exercise Price, Exercised | $ / shares	7.13
Weighted Average Exercise Price, Forfeited | $ / shares	5.00
Weighted Average Exercise Price, Options cancelled/expired | $ / shares	7.23
Weighted Average Exercise Price, Ending balance | $ / shares	6.54
Weighted Average Exercise Price, Exercisable | $ / shares	$ 6.53