Capital Stock - Additional Information (Details)							3 Months Ended		9 Months Ended
	Sep. 13, 2018 USD ($) Party $ / shares shares	Aug. 17, 2018 Store	Aug. 15, 2018 USD ($) Holder $ / shares shares	Jun. 01, 2018 USD ($) $ / shares shares	Jan. 31, 2018 $ / shares shares	Jan. 05, 2018 shares	Sep. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2018 shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Subsidiary Sale Of Stock [Line Items]
Share price, per share | $ / shares				$ 3.14
Warrants exercisable into shares of common stock				1,183,116	570,287
Exercise price of warrants, per share | $ / shares				$ 3.02	$ 9.15		$ 3.66		$ 3.66
Sale of common stock, net of offering costs | $				$ 3,585,000					$ 3,585,000	$ 4,641,000
Total face amount | $							$ 6,107,000		6,107,000		$ 8,940,000
Debt exchange conversion aggregate amount | $									$ 8,180,000
Convertible notes converted into shares of common stock					570,287
Number of common stock shares issued upon satisfaction of merger agreement							625,000
Preferred stock convertible into common stock							220,000	404,000
Warrants exercised (in shares)							233,000
Warrants weighted average exercise price | $ / shares							$ 11.38
Shares issued for warrants exercise							81,000
Warrants outstanding							4,739,371		4,739,371
Warrants exercisable							156,543		156,543
Average exercise price of warrants exercisable, per share | $ / shares							$ 11.02		$ 11.02
Unitron Assets [Member] | Dominican Republic [Member]
Subsidiary Sale Of Stock [Line Items]
Number of common stock shares issued upon satisfaction of merger agreement						625,000
Number of retail electronic stores acquired | Store		7
Exchange [Member]
Subsidiary Sale Of Stock [Line Items]
Number of holders | Holder			21
Total face amount | $			$ 11,019,000
Promissory notes accrued interest | $			426,000
Debt exchange conversion aggregate amount | $	$ 1,023,000		$ 11,445,000
Number of parties | Party	3
Common Stock [Member]
Subsidiary Sale Of Stock [Line Items]
Shares issued				885,346			59,000
Description of preferred stock convertible into common stock									one-for-one
Preferred stock convertible into common stock							220,000		624,000
Common Stock [Member] | Exchange [Member]
Subsidiary Sale Of Stock [Line Items]
Convertible notes converted into shares of common stock	290,000		3,110,000
Debt exchange conversion price per unit | $ / shares	$ 3.53		$ 3.68
Preferred Stock [Member]
Subsidiary Sale Of Stock [Line Items]
Shares issued				297,770
Warrants [Member]
Subsidiary Sale Of Stock [Line Items]
Life of warrants, having cashless exercise feature				3 years
Warrants exercise lock-out period				6 months
Fair value of warrants estimated on the date of issuance | $				$ 1,280,000
Fair value assumption, risk-free interest rates				2.61%
Fair value assumption,expected term				3 years
Fair value assumption, expected volatility				95.00%
Warrants [Member] | Exchange [Member]
Subsidiary Sale Of Stock [Line Items]
Exercise price of warrants, per share | $ / shares	$ 3.41		$ 3.56
Fair value of warrants estimated on the date of issuance | $	$ 342,000		$ 3,815,000
Fair value assumption, risk-free interest rates	2.68%		2.68%
Fair value assumption,expected term	3 years		3 years
Fair value assumption, expected volatility	90.00%		90.00%
Each unit comprised of common stock and warrant to purchase number of common share	1		1
Warrants exercisable beginning date	Mar. 13, 2019		Feb. 15, 2019
Warrants exercisable expiration date	Sep. 13, 2021		Aug. 15, 2021