Subsequent Event (Details) - USD ($) $ / shares in Units, $ in Millions				9 Months Ended
	Nov. 14, 2017	Nov. 01, 2017	Oct. 04, 2017	Sep. 30, 2017
Subsequent Event [Line Items]
Options granted (in shares)				248,025
Exercise price of options granted (in USD per share)				$ 1.85
Subsequent Event
Subsequent Event [Line Items]
Options granted (in shares)			1,055,000
Exercise price of options granted (in USD per share)			$ 1.59
Net proceeds from sale of stock	$ 7.0
Number of units sold (in units/shares)	5,525,000	5,525,000
Warrant price per unit (USD per unit)		$ 0.01
Subsequent Event | Underwriter
Subsequent Event [Line Items]
Additional net proceeds	$ 1.1
Subsequent Event | Common Warrants
Subsequent Event [Line Items]
Number of securities called by each warrant (in warrant)		1
Number of warrant sold (in units)	10,000,000
Expiration period		5 years
Subsequent Event | Common Warrants | Underwriter
Subsequent Event [Line Items]
Number of warrant sold (in units)		1,500,000
Warrant price per unit (USD per unit)		$ 0.01
Exercise price of warrants (USD per share)		$ 0.80
Subsequent Event | Pre-Funded Warrant
Subsequent Event [Line Items]
Number of securities called by each warrant (in warrant)		1
Number of warrant sold (in units)	4,475,000	4,475,000
Warrant price per unit (USD per unit)		$ 0.79
Exercise price of warrants (USD per share)		$ 0.80
Common Stock | Subsequent Event
Subsequent Event [Line Items]
Number of securities called by each warrant (in warrant)		1
Sale of stock, price per share (USD per unit/share)		$ 0.80
Common Stock | Subsequent Event | Underwriter
Subsequent Event [Line Items]
Number of units sold (in units/shares)		1,500,000
Sale of stock, price per share (USD per unit/share)		$ 0.79