Fair Value - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 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	$ 192,109,000	$ 136,110,000	$ 377,061,000	$ 261,805,000
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	(1,100,000)	800,000	(700,000)	(100,000)
Gain on the settlement of contracts	$ 1,100,000	$ 1,200,000	$ 1,600,000	$ 2,300,000
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
Interest rate percentage	6.00%		6.00%
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
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	8,100,000
Diamond State Generation Partners, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investments, fair value	$ 27,800,000		$ 27,800,000