Power Purchase Agreement Programs - Additional Information (Details)			1 Months Ended	3 Months Ended									6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 23, 2019 USD ($)	Jun. 14, 2019 USD ($) MW	Mar. 31, 2013 USD ($)	Mar. 31, 2020 MW	Dec. 31, 2019 USD ($) variable_interest_entity	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) variable_interest_entity MW	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Sep. 30, 2013 USD ($)
Variable Interest Entity [Line Items]
Standard warranty period																	1 year
Number of variable interest entities | variable_interest_entity					6												6
Redeemable noncontrolling interest					$ 443,000	$ 557,000	$ 505,000	$ 58,802,000	$ 57,261,000	$ 56,446,000	$ 54,940,000	$ 58,176,000	$ 505,000	$ 54,940,000	$ 557,000	$ 56,446,000	$ 443,000	$ 57,261,000		$ 57,261,000
Number of megawatts available for repurchase | MW		27.5
Purchase agreement, possible indemnification amount	$ 45,000,000	$ 97,200,000
Purchase agreement, possible indemnification amount, maximum	$ 0	0
Possible indemnification, tax expense (benefit) amount		$ 7,500,000
Cash, cash equivalents, restricted cash and restricted cash equivalents, increase (decrease)								89,449,000				(37,020,000)	90,581,000	(30,740,000)	77,390,000	263,614,000	96,903,000	99,873,000	$ (37,303,000)
Borrowings from issuance of debt																	0	0	100,000,000
Revenue					(213,543,000)	(224,307,000)	(200,326,000)	(147,001,000)	(157,145,000)	(168,619,000)	(138,302,000)	(168,582,000)	(347,327,000)	(306,884,000)	(571,634,000)	(475,503,000)	(785,177,000)	(632,648,000)	(365,623,000)
Cost of revenue					188,595,000	181,582,000	171,976,000	145,437,000	150,224,000	141,209,000	111,318,000	124,147,000	317,413,000	235,465,000	498,995,000	376,674,000	687,590,000	526,898,000	381,934,000
Depreciation and amortization								14,225,000				13,304,000	37,034,000	26,466,000	64,948,000	39,757,000	78,584,000	53,887,000	54,376,000
Payments of a deemed dividend to the investor					$ 2,454,000	0	0	0	0	0	0	0					2,454,000	0	0
Debt make-whole payment													(5,934,000)		(5,934,000)		(5,934,000)	0	0
Distribution of redeemable noncontrolling interest													18,690,000		43,713,000		56,459,000	0	0
Accrued distributions to equity investors																	373,000	576,000	576,000
Payments to noncontrolling interests								3,189,000				3,832,000	7,753,000	11,582,000	9,363,000	14,192,000	12,537,000	15,250,000	23,659,000
Total revenue from related parties																	228,100,000	32,381,000	2,176,000
Net cash provided by (used in) financing activities								7,588,000				(10,532,000)	(92,946,000)	11,989,000	(127,427,000)	315,173,000	$ (120,314,000)	317,196,000	142,910,000
Minimum
Variable Interest Entity [Line Items]
Term of power purchase agreements (years)					10 years												10 years
Maximum
Variable Interest Entity [Line Items]
Term of power purchase agreements (years)					21 years												21 years
PPA II
Variable Interest Entity [Line Items]
Number of megawatts available for repurchase | MW		11
Number of replacement megawatts | MW		9.8
PPA IIIb
Variable Interest Entity [Line Items]
Number of replacement megawatts | MW																	5
Cash, cash equivalents, restricted cash and restricted cash equivalents, increase (decrease)																	$ 25,200,000
Borrowings from issuance of debt																	52,000,000
Increase (decrease) in other assets																	(14,600,000)
Variable Interest Entity, Primary Beneficiary | PPA II
Variable Interest Entity [Line Items]
Property, plant and equipment, gross, period increase (decrease)																	(75,100,000)
Increase (decrease) in restricted cash																	108,700,000
Cash, cash equivalents, restricted cash and restricted cash equivalents, increase (decrease)																	113,900,000
Cost of revenue																	153,500,000
Repayments of debt and interest																	83,500,000
Debt make-whole payment																	(5,900,000)
Distribution of redeemable noncontrolling interest																	56,500,000
Accrued distributions to equity investors																	56,500,000
Payments to noncontrolling interests																	56,500,000
Write off of deferred debt issuance cost																	1,200,000
Total revenue from related parties																	253,900,000
Debt repayment—principal																	76,800,000
Net cash provided by (used in) financing activities																	139,200,000
Variable Interest Entity, Primary Beneficiary | PPA IIIb
Variable Interest Entity [Line Items]
Property, plant and equipment, gross, period increase (decrease)																	14,700,000
Depreciation and amortization																	1,700,000
Repayments of debt and interest																	24,400,000
Payments of a deemed dividend to the investor																	2,400,000
Debt make-whole payment																	$ (18,000,000)
Number of megawatts financed | MW																	39.9
Cash and cash equivalents, period increase (decrease)																	$ 20,000,000
Debt repayment—principal																	23,900,000
Increase (decrease) in liabilities																	28,000,000
Increase (decrease) lease liability																	51,900,000
Net cash provided by (used in) financing activities																	$ 26,300,000
New Energy Server Systems | PPA II
Variable Interest Entity [Line Items]
Energy server repurchased | MW																	27.5
Number of megawatts available for purchase | MW																	18
Number of replacement megawatts | MW		30
New Energy Server Systems | PPA IIIb
Variable Interest Entity [Line Items]
Number of replacement megawatts | MW																	5
Write Off Of Energy Servers
Variable Interest Entity [Line Items]
Energy server repurchased | MW																	19
Write Off Of Energy Servers | PPA II
Variable Interest Entity [Line Items]
Cost of revenue																	$ 52,500,000
Write Off Of Energy Servers | Variable Interest Entity, Primary Beneficiary | PPA II
Variable Interest Entity [Line Items]
Cost of revenue																	$ 52,500,000
Write Off Of Energy Servers | Variable Interest Entity, Primary Beneficiary | PPA IIIb
Variable Interest Entity [Line Items]
Energy server repurchased | MW																	5
Selling, general and administrative expense																	$ 1,800,000
Number of megawatts | MW																	3.4
Write Off Of The Customer Financing Lease Receivable | Variable Interest Entity, Primary Beneficiary | PPA IIIb
Variable Interest Entity [Line Items]
Revenue																	$ 11,300,000
Cost of revenue																	$ 19,700,000
Number of megawatts | MW																	1.6
Sale Of Energy Servers | Variable Interest Entity, Primary Beneficiary | PPA II
Variable Interest Entity [Line Items]
Depreciation and amortization																	$ 22,600,000
Electricity
Variable Interest Entity [Line Items]
Revenue					$ (15,059,000)	(15,638,000)	(20,143,000)	(20,389,000)	(20,364,000)	(20,439,000)	(19,863,000)	(19,882,000)	(40,532,000)	(39,745,000)	(56,170,000)	(60,184,000)	(71,229,000)	(80,548,000)	(75,602,000)
Cost of revenue					12,785,000	$ 27,317,000	22,300,000	$ 12,984,000	$ 11,601,000	$ 12,180,000	$ 12,062,000	$ 13,785,000	35,284,000	$ 25,847,000	$ 62,601,000	$ 38,027,000	75,386,000	49,628,000	49,475,000
Electricity | PPA II
Variable Interest Entity [Line Items]
Cost of revenue																	78,400,000
PPA IIIb
Variable Interest Entity [Line Items]
Accrued distributions to equity investors																	4,462,000	1,807,000	1,404,000
Debt repayment—principal																	28,676,000	3,953,000	3,077,000
PPA II
Variable Interest Entity [Line Items]
Accrued distributions to equity investors																	176,364,000	116,942,000	111,296,000
Debt repayment—principal																	144,813,000	$ 65,114,000	$ 53,726,000
Senior secured notes | Senior Secured Notes due March 2025, Non-Recourse | PPA II
Variable Interest Entity [Line Items]
Debt face amount							$ 77,600,000						$ 77,600,000
Debt repayment—principal			$ 28,800,000
Term loan | Senior Secured Notes due October 2020, Non-Recourse | PPA IIIb
Variable Interest Entity [Line Items]
Debt face amount																					$ 32,500,000
Term loan | Senior Secured Notes due October 2020, Non-Recourse | PPA IIIb | Variable Interest Entity, Primary Beneficiary | PPA IIIb
Variable Interest Entity [Line Items]
Debt make-whole payment																	(200,000)
Debt face amount					$ 24,200,000												24,200,000
Subsequent Event | Variable Interest Entity, Primary Beneficiary | PPA IIIb
Variable Interest Entity [Line Items]
Energy server repurchased | MW				0.4
Equity method investee | Diamond State Generation Partners, LLC
Variable Interest Entity [Line Items]
Total revenue from related parties																	$ 223,900,000