Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt and Other Financings - Interest Expense (Details)

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Long-Term Debt and Other Financings - Interest Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Interest expense        
Interest expense $ 172 $ 508 $ 461 $ 1,050
Silicon Valley Bank Loans        
Interest expense        
Interest expense 135 356 373 739
Novartis Note        
Interest expense        
Interest expense $ 37 151 $ 88 309
Other        
Interest expense        
Interest expense   $ 1   $ 2