Summary of Significant Accounting Policies - Segment Reporting - Revenue by Product (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Revenue by product
Total Revenue	$ 21,010	$ 20,124	$ 18,765	$ 38,889	$ 59,899	$ 73,882	$ 63,964
Product and accessories
Revenue by product
Total Revenue	$ 11,427	$ 9,594	$ 9,534	$ 19,128	$ 30,555	35,033	32,720
Total from Micro turbine Products
Revenue by product
Total Revenue						33,196	31,367
C30
Revenue by product
Total Revenue						383	1,101
C65
Revenue by product
Total Revenue						12,021	8,763
C200
Revenue by product
Total Revenue						4,035	3,213
C400
Revenue by product
Total Revenue						321	1,555
C600
Revenue by product
Total Revenue						4,361	5,344
C800
Revenue by product
Total Revenue							4,935
C1000
Revenue by product
Total Revenue						12,075	6,456
Accessories
Revenue by product
Total Revenue						1,837	1,353
Parts and Service
Revenue by product
Total Revenue						30,684	28,475
Rentals
Revenue by product
Total Revenue						$ 8,165	$ 2,769