Acquisitions - Allocation Of Purchase Price (Details) - USD ($) $ in Thousands	Jun. 22, 2020	Jun. 18, 2020
Giner ELX, Inc
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Accounts receivable	$ 1,237
Inventory	4,108
Prepaid expenses and other assets	669
Property, Plant and equipment	596
Identifiable intangibles	29,930
Accounts payable, accrued expenses, deferred revenue and finance obligations	(1,621)
Deferred revenue	(2,350)
Deferred tax liability, net	(5,889)
Total net assets acquired, excluding goodwill	$ 26,680
United Hydrogen Group Inc
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Accounts receivable		$ 444
Inventory		89
Prepaid expenses and other assets		1,152
Property, Plant and equipment		41,244
Leased property		796
Identifiable intangibles		2,338
Long-term debt		(11,336)
Unfavorable customer contract		(15,757)
Accounts payable, accrued expenses, deferred revenue and finance obligations		(4,631)
Total net assets acquired, excluding goodwill		$ 14,339