Shareholders' Equity (Detail Textuals) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended
	Jan. 04, 2018	Jan. 02, 2018	Mar. 30, 2018	Mar. 31, 2018
Cooperation Agreement
Shareholders Equity [Line Items]
Amount of net proceeds			$ 10.0
Unaffiliated institutional investors | Series P Warrant | Cooperation Agreement
Shareholders Equity [Line Items]
Class A common stock per share		$ 1.15
Purchase price of units per share (in dollars per share)		$ 1.14
Amount of gross proceeds		$ 1.8
Amount of net proceeds		$ 1.5
Private Placement | Unaffiliated institutional investors
Shareholders Equity [Line Items]
Number of Class A common stock issue and sold	800,000
Private Placement | Unaffiliated institutional investors | Series P Warrant
Shareholders Equity [Line Items]
Initial exercise price of warrants exercisable	$ 1.15
Exercise price of warrant paid at closing	1.14
Exercise price of warrants payable upon exercise	$ 0.01
Private Placement | Unaffiliated institutional investors | Series O Warrant
Shareholders Equity [Line Items]
Number of shares called by warrants	1,600,000
Initial exercise price of warrants exercisable	$ 1.47
Class A common stock
Shareholders Equity [Line Items]
Common stock issued upon exercise of warrants				800,000
Class A common stock | Private Placement | Unaffiliated institutional investors | Series P Warrant
Shareholders Equity [Line Items]
Number of Class A common stock issue and sold	800,000
Number of shares called by warrants	800,000
Initial exercise price of warrants exercisable	$ 0.01
Period for which warrant exercisable	5 years
Class A common stock | Private Placement | Unaffiliated institutional investors | Series O Warrant
Shareholders Equity [Line Items]
Period for which warrant exercisable	5 years