Related Parties (Details Textual)	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2000 USD ($) shares	Sep. 30, 2017 USD ($) board_member shares	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) board_member shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Related Parties - Enel (Additional Textual) [Abstract]
Newly issued shares (in shares) | shares	300,000
Value of newly issued shares	$ 130,700,000
Number of shares sold by related party (in shares) | shares		0		0
Number of board members Related Party can nominate (in board member) | board_member		1		1
Number of related party representatives on Board (in board member) | board_member		0		0
Revenue from related parties		$ 0	$ 0	$ 0	$ 1,300,000
Accounts receivable balance related to amounts owed by Enel and its designated manufacturers		$ 0		$ 0		$ 0