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Long-Term Debt and Other Financings - Interest Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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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=109500613&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=116634182&loc=SL114868664-224227 + Details
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