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Unaudited Supplemental Pro Forma Information (Detail) - Spectrum Inc and TangenX Technology Corporation $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / shares
Business Acquisition [Line Items] |
Total revenue | $ | $ 162,913
Net income (loss) | $ | $ 17,220
Basic | $ / shares | $ 0.41
Diluted | $ / shares | $ 0.40

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