Share-Based Compensation - Option Activity under the Company's Stock Option Plans (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Number of Shares
Outstanding, beginning of period (in shares)	31,706
Expired (in shares)	(28,940)
Outstanding, end of period (in shares)	2,766	31,706
Options exercisable end of period (in shares)	2,766
Weighted Average Exercise Price
Outstanding, beginning of period (in usd per share)	$ 7.76
Expired (in usd per share)	7.83
Outstanding, end of period (in usd per share)	6.94	$ 7.76
Options exercisable at end of period (in usd per share)	$ 6.94
Weighted Average Remaining Contractual Term (in years)
Outstanding	1 year 3 months 25 days	6 months 29 days
Options exercisable	1 year 3 months 25 days
Aggregate Intrinsic Value
Outstanding	$ 8,329	$ 305,120
Options exercisable, end of period	$ 8,329		$ 255,000