Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Aug. 03, 2018	Jul. 03, 2018	Nov. 27, 2017
Series F Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Conversion price (in dollars per share)			$ 4.50
Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock issued (in shares)		2,547,169
Public offering price (in dollars per share)		$ 2.12
Gross proceeds from public stock offering		$ 5.4
Warrants exercisable (in shares)		7,760,400
Renewal lease term	36 months
Lease expiration date	Mar. 31, 2022
Subsequent Event [Member] | Series F Convertible Preferred Stock [Member]
Subsequent Event [Line Items]
Conversion price (in dollars per share)		$ 2.12