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Development and License Agreements - Summary of Amounts Payable and Amounts Receivable from Fresenius (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Related Party Transactions [Abstract] |  |  |
Payables to Fresenius | [1] | $ 7,812 | $ 4,687
Receivables from Fresenius | [2] | $ 1,777 | $ 231
[1] | Included in “Accounts Payable” and “Accrued Liabilities” in the Company's consolidated balance sheets.
[2] | Included in “Other current assets” in the Company's consolidated balance sheets

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- Definition Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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