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Intangible Assets and Goodwill - Additional Information (Details)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2020
Sep. 30, 2020
USD ($)
segment
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 12, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]                
Amortization expense $ 6,100,000   $ 9,100,000   $ 24,307,000 $ 27,301,000    
Impairment of intangible asset 0 $ 115,500,000 0   115,527,000 0    
Goodwill 55,053,000       $ 55,053,000   $ 55,053,000 $ 55,053,000
Number of operating segments | segment         1      
Goodwill impairment $ 0   $ 0   $ 0 $ 0    
Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow                
Finite-Lived Intangible Assets [Line Items]                
Intangible asset, fair value, measurement input 0.095       0.095      
Developed product rights for Auryxia                
Finite-Lived Intangible Assets [Line Items]                
Intangible assets, estimated useful life 7 years     9 years 7 years   9 years