Fair Value - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2017	Sep. 30, 2016	Sep. 10, 2016	Jan. 29, 2016	Dec. 15, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost of revenue	$ 180,006,000	$ 166,805,000	$ 557,067,000	$ 428,610,000
Equity-method investments	5,834,000		5,834,000			$ 6,046,000
Not designated as hedging instrument | Natural gas forward contract
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on derivative	(800,000)	1,100,000	(1,500,000)	1,100,000
Gain on the settlement of contracts	$ 1,100,000	$ 600,000	$ 2,700,000	$ 2,900,000
Convertible promissory notes | Convertible Promissory Notes due December 2020, Recourse
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt face amount									$ 75,000,000	$ 25,000,000	$ 160,000,000
Convertible stock price (in dollars per share)	$ 11.25		$ 11.25						$ 20.61		$ 11.25
Embedded derivative liability	$ 177,200,000		$ 177,200,000						$ 177,200,000
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes due December 2020, Recourse
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt face amount							$ 260,000,000	$ 260,000,000.0
Interest rate percentage							6.00%	5.00%
Energy Servers, Change In Useful Lives
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost of revenue	14,600,000		22,700,000
Write Off Of Energy Servers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost of revenue	0
Diamond State Generation Partners, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity-method investments	$ 27,235,000		$ 27,235,000		$ 27,766,000	$ 0