Subsequent Event (Details) - July 2017 Offering - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		3 Months Ended
	Jul. 12, 2017	Sep. 30, 2017	Jul. 20, 2017	Sep. 30, 2017
Subsequent Event
Subsequent Event [Line Items]
Gross proceeds from issuance of equity	$ 3.5
Series F Convertible Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Shares issued during period (in shares)			7,000
Shares issued (in dollars per share)			$ 1,000
Shares of common stock available for exchange			3,261
Warrants | Subsequent Event
Subsequent Event [Line Items]
Number of warrants authorized to be repurchased			4,200,000.0
Series D and Series E Preferred Stock | Subsequent Event
Subsequent Event [Line Items]
Number of warrants authorized to be repurchased			21,053
Scenario, Forecast
Subsequent Event [Line Items]
Net proceeds from issuance of stock and warrants		$ 3.5
Gross proceeds from issuance of equity		$ 3.5
Scenario, Forecast | Subsequent Event
Subsequent Event [Line Items]
Gross proceeds from issuance of equity				$ 7.0