Stock Options and Restricted Stock - Summary of Activity for Stock Option Programs (Detail) - $ / shares		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options beginning balance		320,626		345,518	446,254
Granted		39,000		29,666	12,000
Cancelled		(214,960)		(54,558)	(110,636)
Exercised	[1]				2,100
Number of options ending balance		144,666	[2]	320,626	345,518
Options exercisable		81,889	[2]	273,960	312,518
Exercise price per share, lower range limit beginning balance		$ 2.14		$ 7.10	$ 7.49
Exercise price per share, upper range limit beginning balance		13.84		13.84	13.84
Exercise price per share, granted					7.10
Exercise price per share, exercised	[1]				9.22
Exercise price per share, lower range limit ending balance		2.06	[2]	2.14	7.10
Exercise price per share, upper range limit ending balance		13.84	[2]	13.84	13.84
Exercise price per share, option exercisable lower range limit		2.14	[2]	7.10	7.49
Exercise price per share, option exercisable upper range limit		13.84	[2]	13.84	13.84
Weighted average exercise price, beginning balance		8.78		9.67	10.38
Weighted average exercise price, granted		5.46		2.35	7.10
Weighted average exercise price, cancelled		9.22		10.94	12.25
Weighted average exercise price, exercised	[1]				9.22
Weighted average exercise price, ending balance		7.23	[2]	8.78	9.67
Weighted average exercise price, options exercisable		9.25	[2]	9.50	9.75
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share, granted		5.27		2.14
Exercise price per share, cancelled		9.22		10.76	9.22
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share, granted		5.58		2.61
Exercise price per share, cancelled		$ 9.24		$ 11.21	$ 13.84

[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, $0, and $0 for 2018, 2017, and 2016.

[2] The aggregate intrinsic value, which represents the difference between the price of the Company's common stock at December 31, 2018 and the related exercise price of the underlying options, was $69,000 for outstanding options and $23,000 for exercisable options as of December 31, 2018. The remaining contractual life was 6.97 years for outstanding options and 5.35 years for exercisable options at December 31, 2018.