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Acquisitions - Goodwill (Details) - USD ($) $ in Thousands	Jun. 22, 2020	Jun. 18, 2020	Jun. 30, 2020	Dec. 31, 2019
Total goodwill recognized			$ 70,402	$ 8,842
Giner ELX, Inc
Consideration paid	$ 52,223
Less: net assets acquired	(26,930)
Total goodwill recognized	$ 25,293
United Hydrogen Group Inc
Consideration paid		$ 50,986
Less: net assets acquired		(14,603)
Total goodwill recognized		$ 36,383