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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventories    
Work in process $ 383 $ 810
Finished goods 1,239 544
Total 1,622 $ 1,354 [1]
Advance payments for raw materials $ 3,000  
[1] The balance sheet at December 31, 2019 has been derived from the audited financial statements included in Rigel’s Annual Report on Form 10-K for the year ended December 31, 2019.