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Organization and Summary of Significant Accounting Policies - Product Warranty (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 14, 2014
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Product Warranties Disclosures [Abstract]        
Product warranty accrual, current   $ 504 $ 513  
Non-volatile Memory Products [Member]        
Product Warranties Disclosures [Abstract]        
Product warranty   Our non-volatile memory ("NVM") products are sold with a limited warranty for a period of one year, warranting that the product conforms to specifications and is free from material defects in design, materials and workmanship.    
Product warranty period   1 year    
Product warranty accrual recorded   $ 0 0  
Product warranty accrual, current   $ 51 51  
Products of Acquiree [Member]        
Product Warranties Disclosures [Abstract]        
Product warranty accrual recorded $ 401   $ 53  
Product warranty accrual       $ 453
Product warranty accrual, current       186
Product warranty accrual, noncurrent       $ 267