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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

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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