Revenue Recognition - Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Revenue, net:
Total revenue, net	$ 15,643	$ 23,903
Product and accessories
Revenue, net:
Total revenue, net	5,361	13,207
Microturbine Products
Revenue, net:
Total revenue, net	5,262	13,007
Accessories
Revenue, net:
Total revenue, net	99	200
Service
Revenue, net:
Total revenue, net	7,899	7,666
Rentals
Revenue, net:
Total revenue, net	2,383	3,030
Total North America
Revenue, net:
Total revenue, net	9,453	12,829
UNITED STATES
Revenue, net:
Total revenue, net	8,931	11,534
MEXICO
Revenue, net:
Total revenue, net	492	724
All other North America
Revenue, net:
Total revenue, net	30	571
Total Europe
Revenue, net:
Total revenue, net	3,424	6,906
Asia
Revenue, net:
Total revenue, net	502	694
AUSTRALIA
Revenue, net:
Total revenue, net	1,702	2,998
All other
Revenue, net:
Total revenue, net	$ 562	$ 476