Acquisition of Unitron Assets - Additional Information (Detail)					1 Months Ended		3 Months Ended			9 Months Ended
	Aug. 17, 2018 USD ($) Store $ / shares shares	Mar. 12, 2018 USD ($) shares	Jan. 05, 2018 shares	Aug. 02, 2017 shares	Sep. 30, 2018 USD ($)	Dec. 31, 2017 shares	Sep. 30, 2018 USD ($) shares	Mar. 31, 2018 shares	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)
Business Acquisition [Line Items]
Number of common stock shares issued upon satisfaction of merger agreement | shares							625,000
Common stock, shares issued | shares								175,000
Net sales							$ 7,137,000		$ 2,514,000	$ 21,846,000	$ 8,714,000
Business acquisition, operating loss							3,514,000		$ 3,740,000	9,134,000	$ 4,853,000
Cooltech Holding Corp. ("Cooltech") [Member]
Business Acquisition [Line Items]
Aggregate purchase price		$ 7,900,000
Common stock, shares issued | shares		675,656		100,000
Cooltech Holding Corp. ("Cooltech") [Member] | Merger Agreement [Member]
Business Acquisition [Line Items]
Number of common stock shares issued upon satisfaction of merger agreement | shares	625,000		625,000
Common stock, shares issued | shares						1,875,000
Unitron Assets [Member]
Business Acquisition [Line Items]
Aggregate purchase price	$ 6,359,000
Cancellation of advanced fund to grantor included in other account receivable	3,700,000				$ 1,450,000		$ 1,450,000			1,450,000
Assumption of debt under merger consideration	$ 868,000
Discount on market value per share	25.00%
Market value per share | $ / shares	$ 3.82
Trading restriction period on shares	6 months
Business acquisition, pro forma net sales										24,172,000
Business acquisition, pro forma net loss										$ 9,706,000
Unitron Assets [Member] | Restricted Stock Award [Member]
Business Acquisition [Line Items]
Common stock, shares issued | shares	625,000
Shares issued value under merger consideration	$ 1,791,000
Unitron Assets [Member] | Dominican Republic [Member]
Business Acquisition [Line Items]
Number of common stock shares issued upon satisfaction of merger agreement | shares			625,000
Number of retail electronic stores acquired | Store	7
Net sales					503,000
Business acquisition, operating loss					$ 98,000