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Fair Value Measurements - Changes in level 3 inputs (Details) - Yaskawa Note - Yaskawa - Fair Value, Inputs, Level 3
$ in Thousands
12 Months Ended
Mar. 31, 2022
USD ($)
Fair Value, Option, Quantitative Disclosures [Line Items]  
Fair value at beginning of period $ 16,128
Interest expense accrued 77
Decrease in fair value (605)
Conversion (15,600)
Fair value at period end $ 0