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Basis of Presentation and Summary of Significant Accounting Policies - Commercial License and Other Economic Rights (Details) - Commercial license rights - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Commercial License and Other Economic Rights |  |
Gross | $ 28,298 | $ 28,298
Adjustments | (17,550) | (17,319)
Net | 10,748 | 10,979
Accumulated amortization on finite-lived intangible assets | (11,600) | (11,300)
Credit loss adjustments of finite-lived intangible assets | $ (6,000) | $ (6,000)

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