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Debts - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 12, 2020
shares
$ / shares
Feb. 29, 2020
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Apr. 04, 2018
USD ($)
Oct. 31, 2017
USD ($)
Line of Credit Facility [Line Items]                      
Aggregate principal amount of loans outstanding       $ 35,901,000   $ 35,901,000          
Revolving loan                   $ 10,000,000  
Accrued interest on promissory note       38,000 $ 38,000 112,000 $ 112,000        
Outstanding balance on line of credit facility       10,200,000   10,200,000   $ 10,500,000      
Changes in fair value of promissory note       (709,000) (17,000) (46,000) (101,000)        
Maximum number of shares of common stock issuable (in shares) | shares 3,076,171                    
Conversion price per share on convertible note payable (in dollars per share) | $ / shares $ 5.12                    
Interest expense       191,000 191,000 569,000 567,000        
Accounts Payable and Accrued Liabilities                      
Line of Credit Facility [Line Items]                      
Interest expense       762,000              
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       10,000,000.0   10,000,000.0   10,000,000.0      
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 10,000,000  
Tranche B-1 Loan                      
Line of Credit Facility [Line Items]                      
Long-term loan facility                 $ 2,000,000 2,000,000.0  
Tranche C Note                      
Line of Credit Facility [Line Items]                      
Long-term loan facility       $ 10,000,000.0   $ 10,000,000.0          
Revolving loan                   $ 10,000,000.0  
Interest rate per annum       6.00%   6.00%       6.00%  
Accrued interest on promissory note       $ 153,000 153,000 $ 457,000 455,000        
Yaskawa Note                      
Line of Credit Facility [Line Items]                      
Interest rate per annum       1.00%   1.00%         1.00%
Changes in fair value of promissory note           $ 46,000   167,000      
Unsecured subordinated convertible promissory note       $ 15,448,000   15,448,000   15,336,000     $ 15,000,000.0
Maximum number of shares of common stock issuable (in shares) | shares 3,076,171                    
Interest expense       38,000 $ 38,000 112,000 $ 112,000        
Accrued interest on promissory note       $ 448,000   $ 448,000   $ 336,000