Investment in Joint Venture - Income statement information (Details) - Aizu Fajitsu Semiconductor Wafer Solution Limited - USD ($) $ in Thousands	3 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Mar. 31, 2021	Jul. 31, 2021	Mar. 31, 2022	Mar. 31, 2022	Dec. 31, 2020
Summary of Variable Interest Entities [Roll Forward]
Balance at the beginning	$ (1,466)	$ (1,866)	$ 0	$ (1,866)	$ (1,688)
Investment	968	2,490	2,036		7,348
Loss	(1,468)	(2,078)	(1,893)		(6,836)
Gain		1,455
Effect of exchange rate change	100	(1)	0		(290)
Balance at the end	$ (1,866)	$ 0	$ 143	$ 143	$ (1,466)