Investment in Joint Venture - Summarized financial information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022
Variable Interest Entity [Line Items]
Current assets	$ 55,854		$ 44,794
Variable Interest Entity, Measure of Activity [Abstract]
Gross loss	1,106	$ 649
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Current assets	1,769		4,259
Long-term assets	5,248		3,690
Other current liabilities	4,882		3,799
Net surplus	3,320		4,151
Variable Interest Entity, Measure of Activity [Abstract]
Sales	2,821	1,430
Gross loss	(2,037)	(2,399)
Net loss	(2,451)	$ (3,041)
Fujitsu Semiconductor Limited | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Due to (from) related party			$ (1)
GaNovation | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Due to (from) related party	$ 0