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Business Combinations - Additional Information (Details) - USD ($)
$ in Thousands
Aug. 27, 2015
Dec. 31, 2017
Dec. 01, 2016
DTS Merger      
Acquired Finite-Lived Intangible Assets [Line Items]      
Aggregate purchase price   $ 954,705 $ 954,705
Cash and cash equivalents   $ 53,377 $ 53,377
Ziptronix, Inc      
Acquired Finite-Lived Intangible Assets [Line Items]      
Cash and cash equivalents $ 1,900    
Aggregate purchase price 39,000    
Working capital assumed 1,500    
Amount of consideration withheld until certain employees fulfill length-of-employment obligations $ 700