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Development and License Agreements - Summary of Amounts Payable and Amounts Receivable from Fresenius (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Related Party Transactions [Abstract]    
Payables to Fresenius [1] $ 5,652 $ 4,687
Receivables from Fresenius [2] $ 1,381 $ 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