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Debts - Additional Information (Details)
1 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended
Feb. 12, 2020
shares
$ / shares
Feb. 29, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 04, 2018
USD ($)
Apr. 02, 2018
USD ($)
Oct. 31, 2017
USD ($)
Line of Credit Facility [Line Items]                  
Aggregate principal amount of loans outstanding     $ 41,358,000            
Revolving loan             $ 10,000,000    
Outstanding balance on line of credit facility     10,600,000 $ 10,500,000          
Changes in fair value of promissory note     2,321,000 (33,000)          
Interest expense     189,000 187,000          
Conversion price per share on convertible note payable (in dollars per share) | $ / shares $ 5.12                
Maximum number of shares of common stock issuable (in shares) | shares 3,076,171                
Yaskawa                  
Line of Credit Facility [Line Items]                  
Letter of intent for development activities   $ 4,000,000.0              
Yaskawa | Forecast                  
Line of Credit Facility [Line Items]                  
Proceeds from Collaborators         $ 1,000,000.0        
Loan and Security Agreement (LSA)                  
Line of Credit Facility [Line Items]                  
Long-term loan facility             15,000,000.0    
Aggregate principal amount of loans outstanding     15,000,000.0            
Tranche A Loan                  
Line of Credit Facility [Line Items]                  
Long-term loan facility             5,000,000.0    
Tranche B Loan                  
Line of Credit Facility [Line Items]                  
Long-term loan facility     8,000,000.0 8,000,000     8,000,000    
Tranche B-1 Loan                  
Line of Credit Facility [Line Items]                  
Long-term loan facility     2,000,000.0 2,000,000     $ 2,000,000    
Tranche C Note                  
Line of Credit Facility [Line Items]                  
Long-term loan facility     $ 10,000,000.0            
Revolving loan               $ 10,000,000.0  
Interest rate per annum     6.00%         6.00%  
Accrued interest on promissory note     $ 152,000 $ 150,000          
Yaskawa Note                  
Line of Credit Facility [Line Items]                  
Long-term loan facility     $ 15,000,000.0            
Interest rate per annum     1.00%           1.00%
Changes in fair value of promissory note     $ 2,300,000     $ 167,000      
Unsecured subordinated convertible promissory note     15,373,000     15,336,000     $ 15,000,000.0
Interest expense     37,000            
Accrued interest on promissory note     $ 373,000     $ 336,000      
Maximum number of shares of common stock issuable (in shares) | shares 3,076,171