Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Additional Information (Detail)

Stock-based Compensation - Additional Information (Detail) - USD ($)					3 Months Ended					9 Months Ended
	Sep. 27, 2018	Jun. 22, 2018	Jun. 22, 2017	Feb. 09, 2017	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of stock options outstanding					1,813,633					1,813,633
Shares available for future issuance					195,617					195,617
Plan [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of additional shares authorized for issuance under an established share-based compensation plan		1,500,000
Aggregate number of shares authorized		2,250,000
Maximum number of shares per individual per calendar year		1,000,000
Stock option awards					1,425,000		0			1,553,000	105,600
Weighted-average grant date fair value					$ 0.72		$ 0			$ 0.79	$ 3.60
Stock options vested										1,028,852
Stock options forfeited										1,500
Number of stock options, exercised										0
Plan [Member] \| Non-employee Directors [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards	125,000	14,000	14,000
Exercise price	$ 0.73	$ 1.52	$ 3.70
Annual retainer amount for the threshold of stock precluded from selling										$ 270,000
Plan [Member] \| Non-employee Directors [Member] \| Restricted Stock [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Restricted shares awarded to each non-employee director		4,000		4,000
Restricted shares vest in each quarter end						1,000	1,000	1,000	1,000
Restricted shares vesting rights										Under the Plan, of which, 1,000 restricted shares vested at the end of each calendar quarter in 2017.
Plan [Member] \| Chief Executive Officer [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards	400,000
Exercise price	$ 0.73
Plan [Member] \| Chief Financial Officer [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards	250,000
Exercise price	$ 0.73
Plan [Member] \| Senior Vice President [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards	220,000
Exercise price	$ 0.73
Plan [Member] \| Management [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards		62,000	45,500
Exercise price		$ 1.52	$ 3.70
Plan [Member] \| Staff [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock option awards		10,000	4,100
Exercise price		$ 1.52	$ 3.70