Subsequent Events (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares shares
Investment in Bitzumi	$ 1,000,000
Investment in Bitzumi, Remaining Amount	9,000,000
Bitzumi, Warrant to Purchase Common Shares	4,000,000
Bitzumi, total Investment	$ 10,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares	$ 2.50
Warrant to purchase common share, Bitzumi | shares	30,000,000
Investment in Miso Robotics	$ 6,000,000
Percentage of ownership, Miso Robotics	30.00%
Stock repurchase program, authorized amount	$ 20,000,000