Common Stock and Preferred Stock (Details) - $ / shares	3 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Common Stock and Preferred Stock
Common stock, increase in number of shares authorized	90,000,000
Common stock, shares authorized	150,000,000	60,000,000
Preferred stock, shares authorized	10,000,000	0
Preferred stock, par value	$ 0.001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0