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Condensed consolidated financial statement details - Other Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
POP Displays $ 3,612 $ 7,595  
Deferred Income Tax Assets, Net 966 864  
Deposits and other 7,193 7,002  
Other long-term assets 11,771 15,461  
Amortization of intangible assets 4,600 7,800 $ 11,400
Amortization $ 4,200 $ 7,500 $ 13,500