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Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 04, 2018	Oct. 02, 2018	Sep. 30, 2018	Dec. 31, 2017
Subsequent Event [Line Items]
Common stock, par value (in dollars per share)			$ 0.001	$ 0.001
Subsequent Events
Subsequent Event [Line Items]
Units offered during the period	36,910,809
Number of common stock under each common units	1
Number of warrant to purchase share of common stock under common unit	1
Number of warrant to purchase share of common stock under pre-funded units	1
Number of warrant to purchase common stock warrant under pre-funded units	1
Common stock, par value (in dollars per share)	$ 0.001
Gross proceeds from units offering	$ 11.1
Subsequent Events | Common Stock Warrant
Subsequent Event [Line Items]
Common stock warrants exercisable at an exercise price	$ 0.30
Subsequent Events | Common Units
Subsequent Event [Line Items]
Units offered during the period	8,065,000
Units offered during the period, price per unit	$ 0.30
Subsequent Events | Pre-funded Units
Subsequent Event [Line Items]
Units offered during the period	28,845,809
Units offered during the period, price per unit	$ 0.30
Subsequent Events | Senior Secured Convertible Notes due August 15 2018
Subsequent Event [Line Items]
Payment on principle amount of note	$ 7.4	$ 7.4

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