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Debts - Additional Information (Details)
1 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Feb. 12, 2020
shares
$ / shares
Feb. 29, 2020
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Apr. 04, 2018
USD ($)
Apr. 02, 2018
USD ($)
Oct. 31, 2017
USD ($)
Line of Credit Facility [Line Items]                        
Aggregate principal amount of loans outstanding     $ 36,510,000   $ 36,510,000              
Revolving loan                   $ 10,000,000    
Accrued interest on promissory note     37,000 $ 37,000 74,000 $ 74,000            
Outstanding balance on line of credit facility     10,800,000   10,800,000     $ 10,500,000        
Changes in fair value of promissory note     (1,658,000) (51,000) 663,000 (84,000)            
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     189,000 189,000 378,000 376,000            
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   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   2,000,000.0       $ 2,000,000 $ 2,000,000    
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     $ 152,000 152,000 $ 304,000 302,000            
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         $ 663,000     167,000        
Unsecured subordinated convertible promissory note     $ 15,411,000   15,411,000     15,336,000       $ 15,000,000.0
Maximum number of shares of common stock issuable (in shares) | shares 3,076,171                      
Interest expense     37,000 $ 37,000 74,000 $ 74,000            
Accrued interest on promissory note     $ 411,000   $ 411,000     $ 336,000