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Development and License Agreements - Summary of Amounts Payable and Amounts Receivable from Fresenius (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Related Party Transactions [Abstract] |  |  |
Payables to Fresenius | [1] | $ 13,838 | $ 8,470
Receivables from Fresenius | [2] | $ 2,380 | $ 1,796
[1] | Included in “Accounts Payable” and “Accrued Liabilities” in the Company's consolidated balance sheets.
[2] | Included in “Prepaid and other current assets” in the Company's consolidated balance sheets.

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