Stockholders' Equity (Details)	9 Months Ended
	Sep. 30, 2018 USD ($) Vote $ / shares shares	Dec. 31, 2017 $ / shares shares
Stockholders' Equity
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares outstanding	0	0
Common stock, shares authorized	100,000,000	100,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.00001	$ 0.00001
Number of votes per share | Vote	1
Dividends declared | $	$ 0