Description of Business and Basis of Presentation - Narrative (Details) customer in Thousands		6 Months Ended
	Jul. 29, 2019 shares	Jun. 30, 2019 state customer renewal_option
Subsequent Event [Line Items]
Number of customers | customer		67
Number of states in which entity operates (more than) | state		20
Agreement term		25 years
Subsequent Event
Subsequent Event [Line Items]
Reverse stock split ratio (in shares) | shares	0.4286
Lease and Power Purchase Agreement (PPA) [Member]
Subsequent Event [Line Items]
Number of options to renew term		2
Renewal term		5 years
Revenue under PPAs
Subsequent Event [Line Items]
Agreement term		25 years
Number of options to renew term		2
Renewal term		5 years