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Unaudited Supplemental Pro Forma Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Spectrum Inc and TangenX Technology Corporation      
Business Acquisition [Line Items]      
Total revenue $ 162,913 $ 145,994  
Net income $ 17,220 $ (12,656)  
Basic $ 0.41 $ (0.32)  
Diluted $ 0.40 $ (0.32)  
TangenX Technology Corporation      
Business Acquisition [Line Items]      
Total revenue   $ 110,228 $ 88,437
Net income   $ 5,744 $ 13,208
Basic   $ 0.17 $ 0.40
Diluted   $ 0.17 $ 0.39