Summary of Significant Accounting Policies - Other information (Details) - USD ($)			1 Months Ended		3 Months Ended	12 Months Ended
	Nov. 11, 2024	Mar. 20, 2024	Dec. 31, 2024	May 31, 2020	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024	Mar. 21, 2024	Mar. 12, 2024	Dec. 31, 2021	May 29, 2020	May 18, 2020
Summary of Significant Accounting Policies
Contract asset impairment charge					$ 38,300,000		$ 2,400,000
Operating lease maximum allowed extension percentage						75.00%
Fair Value			$ 0		0	$ 0	0
Equity securities			0		0	$ 0	0
Minimum number of days after an invoice is issued when accounts receivable is considered due						30 days
Maximum number of days after an invoice is issued when accounts receivable is considered due						120 days
Allowance for doubtful accounts receivable			37,712,000		37,712,000	$ 37,712,000	8,798,000
Impairment					902,200,000	949,300,000	269,500,000
Principal received at issuance						190,000,000
Property, Plant and Equipment
Goodwill			0		0	0	0
3.75% Convertible Senior Notes
Summary of Significant Accounting Policies
Principal amount			$ 58,462,000	$ 212,500,000	$ 58,462,000	$ 58,462,000	$ 197,278,000		$ 58,500,000			$ 12,500,000	$ 200,000,000
Conversion of debt		$ 138,800,000		$ 138,800,000
Interest rate (as a percent)		3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%	3.75%
7.0% Convertible Senior Notes
Summary of Significant Accounting Policies
Principal amount		$ 140,400,000	$ 140,396,000	$ 140,400,000	$ 140,396,000	$ 140,396,000		$ 140,400,000		$ 140,400,000
Interest rate (as a percent)		7.00%	7.00%	7.00%	7.00%	7.00%		7.00%		7.00%
6.0% Convertible Debenture
Summary of Significant Accounting Policies
Principal received at issuance	$ 190,000,000					$ 190,000,000
Interest rate (as a percent)	6.00%		6.00%		6.00%	6.00%
Convertible Debenture Purchase Agreement
Summary of Significant Accounting Policies
Principal amount	$ 200,000,000
Principal received at issuance	190,000,000					$ 190,000,000
Fuel
Property, Plant and Equipment
Estimated useful life			10 years		10 years	10 years
Hydrogen infrastructure
Property, Plant and Equipment
Estimated useful life			20 years		20 years	20 years
Minimum [Member]
Summary of Significant Accounting Policies
Payment terms for fuel cells and its services						30 days
Extension period						5 years
Warranty term			1 year		1 year	1 year
Maximum [Member]
Summary of Significant Accounting Policies
Payment terms for fuel cells and its services						90 days
Extension period						10 years
Warranty term			2 years		2 years	2 years
Maximum [Member] | 6.0% Convertible Debenture
Summary of Significant Accounting Policies
Conversion of debt	$ 22,500,000		$ 22,500,000
Building and leasehold improvements | Minimum [Member]
Property, Plant and Equipment
Estimated useful life			10 years		10 years	10 years
Building and leasehold improvements | Maximum [Member]
Property, Plant and Equipment
Estimated useful life			30 years		30 years	30 years
Machinery and equipment | Minimum [Member]
Property, Plant and Equipment
Estimated useful life			2 years		2 years	2 years
Machinery and equipment | Maximum [Member]
Property, Plant and Equipment
Estimated useful life			30 years		30 years	30 years
Software | Minimum [Member]
Property, Plant and Equipment
Estimated useful life			1 year		1 year	1 year
Software | Maximum [Member]
Property, Plant and Equipment
Estimated useful life			5 years		5 years	5 years
Hydrogen Production Plants [Member]
Property, Plant and Equipment
Estimated useful life			30 years		30 years	30 years