Fair Value Measurements - Changes in fair value of the promissory note (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2022 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest expense
Yaskawa Note
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Interest expense accrued	$ 100
Yaskawa Note | Yaskawa | Fair Value, Inputs, Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
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