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
Mar. 31, 2021
Mar. 31, 2020
Interest expense    
Interest expense $ 289 $ 542
Silicon Valley Bank Loans    
Interest expense    
Interest expense 238 383
Novartis Note    
Interest expense    
Interest expense $ 51 158
Other    
Interest expense    
Interest expense   $ 1