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Financial Statement Components - Summary of Carrying Values of Intangible Assets (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Cost $ 26,219 $ 3,850
Accumulated Amortization 6,739 2,388
Acquired Intangibles, Net $ 19,480 1,462 [1]
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Estimated Lives 5 years  
Cost $ 20,121 840
Accumulated Amortization 4,460 840
Acquired Intangibles, Net $ 15,661  
Customer Relationships | Minimum    
Finite Lived Intangible Assets [Line Items]    
Estimated Lives 2 years  
Customer Relationships | Maximum    
Finite Lived Intangible Assets [Line Items]    
Estimated Lives 5 years  
Developed Technology Rights    
Finite Lived Intangible Assets [Line Items]    
Cost $ 6,098 3,010
Accumulated Amortization 2,279 1,548
Acquired Intangibles, Net $ 3,819 $ 1,462
Developed Technology Rights | Minimum    
Finite Lived Intangible Assets [Line Items]    
Estimated Lives 4 years  
Developed Technology Rights | Maximum    
Finite Lived Intangible Assets [Line Items]    
Estimated Lives 5 years  
[1] See Note 2 for a summary of adjustments.