Stock Options and Restricted Stock - Summary of Activity for Stock Option Programs (Detail) - $ / shares		12 Months Ended
		Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options beginning balance		550,040		144,666	320,626
Granted		444,557		449,450	39,000
Cancelled		(42,928)		(44,076)	(214,960)
Exercised	[1]	0		0	0
Number of options ending balance		951,669	[2]	550,040	144,666
Options exercisable		178,307	[2]	62,778	81,889
Exercise price per share, lower range limit beginning balance		$ 2.14		$ 2.14	$ 7.10
Exercise price per share, upper range limit beginning balance		13.84		13.84	13.84
Exercise price per share, exercised	[1]	0		0	0
Exercise price per share, lower range limit ending balance		2.14	[2]	2.14	2.14
Exercise price per share, upper range limit ending balance		13.53	[2]	13.84	13.84
Exercise price per share, option exercisable lower range limit		2.14	[2]	2.14	7.10
Exercise price per share, option exercisable upper range limit		13.53	[2]	13.84	13.84
Weighted average exercise price, beginning balance		6.58		7.23	8.78
Weighted average exercise price, granted		6.24		6.61	5.46
Weighted average exercise price, cancelled		6.91		9.00	9.22
Weighted average exercise price, exercised	[1]	0		0	0
Weighted average exercise price, ending balance		6.41	[2]	6.58	7.23
Weighted average exercise price, options exercisable		6.33	[2]	7.60	9.25
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share, granted		5.21		5.27	2.14
Exercise price per share, cancelled		6.55		9.22	10.76
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share, granted		7.25		5.58	2.61
Exercise price per share, cancelled		$ 13.84		$ 9.24	$ 11.21

[1] The aggregate intrinsic value, which represents the difference between the price of the Company’s common stock at the exercise date and the related exercise price of the underlying options, was $0 for 2020, 2019, and 2018.

[2] The aggregate intrinsic value, which represents the difference between the price of the Company’s common stock at December 31, 2020 and the related exercise price of the underlying options, was $45,000 for outstanding options and $43,000 for exercisable options as of December 31, 2020. The remaining contractual life was 8.60 years for outstanding options and 7.23 years for exercisable options at December 31, 2020.