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Business Combination - Summary of Purchase Price of Identifiable Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 12, 2018
Business Acquisition [Line Items]      
Goodwill $ 55,053 $ 55,053  
Keryx Biopharmaceuticals, Inc.      
Business Acquisition [Line Items]      
Cash and cash equivalents     $ 5,257
Inventory     235,597
Trade accounts receivable, net     15,834
Prepaid expenses and other current assets     8,399
Goodwill     55,053
Intangible assets:      
Developed product rights for Auryxia     329,130
Other intangible assets     545
Property and equipment, net     3,646
Other assets     14,441
Accounts payable     (17,570)
Accrued expenses     (42,972)
Deferred tax liability     (35,096)
Debt     (15,000)
Fair value of unfavorable executory contract     (29,510)
Total purchase price     $ 527,754