Subsequent Events (Details)	1 Months Ended
	Nov. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2018 $ / shares
Subsequent Events
Preferred stock, par value		$ 0.01
Subsequent event | Series E Redeemable Convertible Preferred Stock
Subsequent Events
Shares issued (in shares) | shares	35,000
Preferred stock, par value	$ 0.01
Proceeds from issuance of preferred stock, net | $	$ 31,000,000
Conversion price per share	$ 2.31
Number of equal monthly installments	13
Amount of monthly installments from May 2019 through May 2020 | $	$ 2.693