Stock Options and Restricted Stock - Summary of Activity for Stock Option Programs (Detail) - $ / shares		3 Months Ended			12 Months Ended
		Jun. 30, 2018		Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options beginning balance		320,626		320,626	345,518
Exercise price per share, granted		$ 5.58
Granted		24,000			29,666
Cancelled		(214,960)			(54,558)
Exercised	[1]	0		0	0
Number of options ending balance		129,666	[2]	320,626	320,626
Exercise price per share, lower range limit beginning balance		$ 2.14		$ 2.14	$ 7.10
Options exercisable at June 30, 2018	[2]	76,000
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		13.84	[2]	13.84	13.84
Exercise price per share, option exercisable lower range limit	[2]	2.22
Exercise price per share, option exercisable upper range limit	[2]	13.84
Weighted average exercise price, beginning balance		8.78		8.78	9.67
Weighted average exercise price, granted		5.58			2.35
Weighted average exercise price, cancelled		9.22			10.94
Weighted average exercise price, exercised	[1]	0		0	0
Weighted average exercise price, ending balance		7.45	[2]	$ 8.78	8.78
Weighted average exercise price, options exercisable	[2]	9.78
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share, granted					2.14
Exercise price per share, cancelled		9.22			10.76
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price per share, granted					2.61
Exercise price per share, cancelled		$ 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 and $0 for the 2018 and 2017 second quarter and six months.

[2] The aggregate intrinsic value, which represents the difference between the price of the Company's common stock at June 30, 2018 and the related exercise price of the underlying options, was $93,000 for outstanding options and $13,000 for exercisable options as of June 30, 2018. The remaining contractual life was 7.17 years for outstanding options and 5.59 years for exercisable options at June 30, 2018.