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LICENSE, COLLABORATION AND OTHER REVENUE (Tables)
 6 Months Ended
Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Revenues Recognized from License, Collaboration and Other Significant Agreements
The Company recognized the following revenues from its license, collaboration and other revenue agreements (in thousands):
 
 Three Months Ended June 30,Six Months Ended June 30,
License, collaboration and other revenue:2023202220232022
MTPC Collaboration Agreement$516 $434 $4,678 $8,398 
Otsuka U.S. Agreement2,225 81,135 2,225 86,773 
Otsuka International Agreement— — — 5,503 
Total collaboration revenue $2,741 $81,569 $6,903 $100,674 
JT and Torii Sublicense Agreement1,391 1,487 2,528 2,633 
Medice License Agreement10,000 — 10,000 — 
Total license, collaboration and other revenue$14,132 $83,056 $19,431 $103,307 
Changes in Contract Assets and Liabilities
The following table presents changes in the Company’s contract assets and liabilities (in thousands):
Six Months Ended June 30, 2023
Balance at
Beginning of
Period		AdditionsDeductionsBalance
at End
of Period
Contract assets:    
Accounts receivable(1)
$1,901 $943 $(2,319)$525 
Prepaid expenses and other current assets$781 $— $(781)$— 
Contract liability:
Deferred revenue$47,034 $— $(3,738)$43,296 
Six Months Ended June 30, 2022
Balance at
Beginning of
Period		AdditionsDeductionsBalance
at End
of Period
Contract assets:
Accounts receivable(1)
$19,094 $92,146 $(54,614)$56,626 
Prepaid expenses and other current assets$4,309 $9,550 $(4,309)$9,550 
Contract liabilities:
Deferred revenue$42,380 $65,042 $(59,079)$48,343 
Accounts payable$3,171 $— $(3,171)$— 
 (1) Excludes accounts receivable related to amounts due to the Company from product sales of Auryxia which are included in the accompanying unaudited condensed consolidated balance sheet as of June 30, 2023 and 2022.
Revenue Recognized Resulting from Changes in Contract Assets and Contract Liabilities
The Company recognized the following revenues as a result of changes in the contract asset and contract liability balances in the respective periods (in thousands): 
Three Months Ended June 30,Six Months Ended June 30,
Revenue Recognized in the Period:2023202220232022
Deferred revenue — beginning of the period$— $15,503 $— $22,105