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Geographic Information - Schedule of Total Revenue Based on Customer's Location (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Total revenue $ 52,833 $ 60,502 $ 152,312 $ 170,398
United States        
Segment Reporting Information [Line Items]        
Total revenue 19,584 27,003 52,962 78,124
Japan        
Segment Reporting Information [Line Items]        
Total revenue 15,157 14,023 43,203 38,971
Asia Pacific, excluding Japan        
Segment Reporting Information [Line Items]        
Total revenue 8,379 9,331 26,368 27,436
EMEA        
Segment Reporting Information [Line Items]        
Total revenue 6,546 8,119 20,345 20,038
Other        
Segment Reporting Information [Line Items]        
Total revenue $ 3,167 $ 2,026 $ 9,434 $ 5,829