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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2022
Dec. 31, 2020
Oct. 04, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Number of common stock shares converted per preferred share (in shares)       3,120,000
Interest expense $ 187 $ 792 $ 760  
Changes in fair value of promissory note (699) 605 927  
Yaskawa Note        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Accrued interest on promissory note 523 0 486  
Interest expense 37 77 150  
Changes in fair value of promissory note $ 699 $ (605) $ 927  
Yaskawa Note | Yaskawa        
Fair Value Measurement Inputs and Valuation Techniques [Line Items]        
Principal and unpaid interest of convertible note       $ 15,600
Principal amount of long term loan facility       15,000
Accrued interest on promissory note       $ 600
Number of common stock shares converted per preferred share (in shares)       3,120,000