Stock Options and Restricted Stock - Summary of Activity for Unvested Options Outstanding (Detail) - $ / shares	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares Roll Forward
Number of options beginning balance	703,948	487,262	487,262
Number of options, granted	0	335,773		449,450
Number of options, cancelled	(1,422)	(14,148)
Number of options, vested	(12,000)	(104,939)
Number of options ending balance	690,526	703,948	690,526	487,262
Exercise price per share beginning balance, Lower limit	$ 2.14	$ 2.14	$ 2.14
Exercise price per share beginning balance, Upper limit	7.25	7.25	7.25
Exercise price per share, Granted		6.68
Exercise price per share, Cancelled, Lower limit	6.55	6.55
Exercise price per share, Cancelled, Upper limit	7.25	7.25
Exercise price per share, Vested		6.55
Exercise price per share ending balance, Lower limit	2.14	2.14	2.14	$ 2.14
Exercise price per share ending balance, Upper limit	7.25	7.25	7.25	7.25
Grant price per share, cancelled, lower limit	2.22
Grant price per share, cancelled, upper limit	5.58
Weighted average exercise price	6.21	6.45	6.45
Weighted average exercise price, granted		6.68
Weighted average exercise price, cancelled	6.95	6.68
Weighted average exercise price, vested	4.46	6.55
Weighted average exercise price	$ 6.61	$ 6.21	$ 6.61	$ 6.45