Merger with Cooltech - Additional Information (Detail)											1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 17, 2018 shares	Mar. 12, 2018 USD ($) $ / shares shares	Mar. 09, 2018 $ / shares	Jan. 31, 2018 $ / shares shares	Jan. 19, 2018 USD ($) $ / shares shares	Jan. 05, 2018 USD ($) shares	Oct. 10, 2017	Aug. 03, 2017 USD ($) $ / shares shares	Aug. 02, 2017 $ / shares shares	Jul. 25, 2017 shares	Dec. 31, 2017 USD ($) shares	Sep. 30, 2018 USD ($) $ / shares shares	Mar. 31, 2018 shares	Sep. 30, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($)	Jun. 01, 2018 $ / shares shares
Business Acquisition [Line Items]
Common stock, shares issued													175,000
Warrants exercisable into shares of common stock				570,287												1,183,116
Exercise price of warrants, per share | $ / shares				$ 9.15								$ 3.66		$ 3.66		$ 3.02
Reverse stock split description			one-for-five reverse stock split				one-for-five reverse stock split
Reverse stock split, conversion ratio			0.2				0.2
Number of common stock shares issued upon satisfaction of merger agreement												625,000
Advances to grantor included in other accounts receivable | $											$ 3,361,000	$ 1,459,000		$ 1,459,000
Common Stock, Debt exchange				570,287
Minimum bid price required for initial listing | $ / shares			$ 4.00
Cooltech Holding Corp. ("Cooltech") [Member]
Business Acquisition [Line Items]
Merger closing date														Mar. 12, 2018
Common stock, shares issued		675,656							100,000
Common stock price, per share | $ / shares									$ 10.00
Warrants exercisable into shares of common stock		389,000			114,285				100,000
Exercise price of warrants, per share | $ / shares					$ 9.15				$ 12.10
Aggregate purchase price | $		$ 7,900,000
Shares for consideration under original merger agreement										2,500,000
Advances to grantor included in other accounts receivable | $															$ 3,700,000
Warrants exercisable commencement date					Jul. 19, 2018
Warrants term of exercise					3 years
Shares issued under private placement		175,000
Common and preferred shares issued		1,875,000
Number of common stock and warrants owned		2,150,000
Percentage of common stock owned		82.00%
Closing market price per share | $ / shares		$ 8.15
Merger consideration outstanding common stock, value | $		$ 5,500,000
Private placement proceeds | $		1,750,000
Cooltech Holding Corp. ("Cooltech") [Member] | Outstanding Stock Warrants and Options [Member]
Business Acquisition [Line Items]
Merger consideration outstanding common stock, value | $		$ 676,000
Cooltech Holding Corp. ("Cooltech") [Member] | Convertible Notes [Member]
Business Acquisition [Line Items]
Convertible notes amount | $					$ 1,000,000
Convertible notes interest rate					0.00%
Convertible notes term					3 years
Common Stock, Debt exchange					114,285
Cooltech Holding Corp. ("Cooltech") [Member] | Stock Purchase Agreement [Member]
Business Acquisition [Line Items]
Common stock, shares issued								175,000
Common stock price, per share | $ / shares								$ 10.00
Warrants exercisable into shares of common stock								175,000
Exercise price of warrants, per share | $ / shares								$ 12.10
Stock purchase agreement date								Aug. 03, 2017
Aggregate purchase price | $								$ 1,750,000
Cooltech Holding Corp. ("Cooltech") [Member] | Merger Agreement [Member]
Business Acquisition [Line Items]
Common stock, shares issued											1,875,000
Reduction in percentage of merger consideration											25.00%
Reduction in number of common shares issued under merger consideration											625,000
Number of common stock shares issued upon satisfaction of merger agreement	625,000					625,000
Cooltech Holding Corp. ("Cooltech") [Member] | Option Agreement [Member]
Business Acquisition [Line Items]
Amount receivable upon transfer of assets | $						$ 4,568,000
Right to exercise option beginning date						Mar. 12, 2018
Right to exercise option ending date						Jan. 05, 2019
Amount payable upon exercise of option | $						$ 4,568,000