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Development and License Agreements - Summary of Amounts Payable and Amounts Receivable from Fresenius (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Related Party Transactions [Abstract] |  |  |
Payables to Fresenius | [1] | $ 9,974 | $ 7,812
Receivables from Fresenius | [2] | $ 1,636 | $ 1,777
[1] | Included in “Accounts Payable” and “Accrued Liabilities” in the Company's condensed consolidated balance sheets.
[2] | Included in “Other current assets” in the Company's condensed consolidated balance sheets

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