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ORGANIZATION, BASIS OF PRESENTATION, AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Organization And Summary Of Significant Accounting Policies [Line Items]
Increase in revenues	$ 13,076	$ 8,071
Decrease in net loss	42,974	42,203
Letter of credit established as a deposit	1,500
Cash and cash equivalents	85,749	80,968	$ 80,428	$ 140,418
Non-current restricted cash	1,500	3,500	1,500	3,500
Cash, cash equivalents and restricted cash as reported within the accompanying Condensed Consolidated Statements of Cash Flows	87,249	84,468	$ 81,928	$ 143,918
Kite Pharma Inc
Organization And Summary Of Significant Accounting Policies [Line Items]
Increase in revenues	$ 7,219	$ 8,312
Kite Pharma Inc | Customer Concentration Risk | Revenue from Contract with Customer
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenues	55.00%	75.00%
Pfizer | Customer Concentration Risk | Revenue from Contract with Customer
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenues	27.00%
Sanofi
Organization And Summary Of Significant Accounting Policies [Line Items]
Increase in revenues	$ 499	$ 1,949
Sanofi | Customer Concentration Risk | Revenue from Contract with Customer
Organization And Summary Of Significant Accounting Policies [Line Items]
Percentage of revenues	4.00%	18.00%
Change in Collaboration Agreement Scope | Collaboration Agreement | Pfizer
Organization And Summary Of Significant Accounting Policies [Line Items]
Increase in revenues	$ 100
Decrease in net loss	$ 100

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