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Balance sheet components - Other Noncurrent LIabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2016
Balance Sheet Related Disclosures [Abstract]      
Pension and other employee-related $ 4,125 $ 4,529  
Deferred rent   3,058  
Government grant 1,380 2,108  
Deferred income tax liabilities 528 0  
Capital lease obligation   282  
Asset retirement obligations 3,529 3,391 $ 3,100
Other 52 131  
Other noncurrent liabilities 9,614 $ 13,499  
Accretion of asset retirement obligations $ 200