Stock Options and Restricted Stock - Summary of Activity for Unvested Options Outstanding (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares Roll Forward
Number of options beginning balance	62,777
Number of options, granted	449,450	39,000	29,666
Number of options, cancelled	(3,076)
Number of options, vested	(21,889)
Number of options ending balance	487,262	62,777
Exercise price per share beginning balance, Lower limit	$ 2.14
Exercise price per share beginning balance, Upper limit	7.10
Exercise price per share, Granted, Lower limit	5.21
Exercise price per share, Granted, Upper limit	7.25
Exercise price per share, Cancelled	6.55
Exercise price per share, Vested, Lower limit	2.14
Exercise price per share, Vested, Upper limit	7.10
Exercise price per share ending balance, Lower limit	2.14	$ 2.14
Exercise price per share ending balance, Upper limit	7.25	7.10
Weighted average exercise price	4.59
Weighted average exercise price, granted	6.61
Weighted average exercise price, cancelled	6.55
Weighted average exercise price, vested	4.40
Weighted average exercise price	$ 6.45	$ 4.59