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Fair Value Measurements - Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Carrying Amount |  |
Fair Value Measurements |  |
Long-term debt | $ 29,952 | $ 32,277
Carrying Amount | Novartis Note |  |
Fair Value Measurements |  |
Long-term debt | 16,220 | 15,903
Carrying Amount | Silicon Valley Bank Loans |  |
Fair Value Measurements |  |
Long-term debt | 13,732 | 16,374
Fair Value |  |
Fair Value Measurements |  |
Long-term debt | 29,939 | 31,761
Fair Value | Novartis Note |  |
Fair Value Measurements |  |
Long-term debt | 16,217 | 15,713
Fair Value | Silicon Valley Bank Loans |  |
Fair Value Measurements |  |
Long-term debt | $ 13,722 | $ 16,048

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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