Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Interest expense    
Interest expense $ 1,919 $ 922
Silicon Valley Bank Loan Agreement    
Interest expense    
Interest expense 1,207 258
Novartis Note    
Interest expense    
Interest expense 706 627
Other    
Interest expense    
Interest expense $ 6 $ 37