Subsequent Events (Details) $ / shares in Units, $ in Millions		1 Months Ended	4 Months Ended
	May 03, 2017 USD ($) $ / shares shares	Jun. 30, 2017 MW	Sep. 30, 2017 Employee
Scenario, Forecast [Member]
Subsequent Event [Line Items]
Number of manufacturing employees | Employee			110
Reduction in production capacity due to production rate adjustment | MW		15
Underwritten Public Offering [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Shares of common stock | shares	12,000,000
Gross proceeds from common stock and warrants | $	$ 15.4
Common stock price per share	$ 1.28
Net proceeds from common stock and warrants | $	$ 13.8
Underwritten Public Offering [Member] | Series C Warrants [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Class of warrants or rights issued | shares	12,000,000
Warrants issued, price per share	$ 1.28
Class of warrant or right, exercise price per share	$ 1.28
Class of warrant or right term	1 year
Underwritten Public Offering [Member] | Series D Warrants [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Class of warrants or rights issued | shares	12,000,000
Warrants issued, price per share	$ 1.28
Class of warrant or right, exercise price per share	$ 1.60
Class of warrant or right term	5 years