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Acquisitions (HEE) - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Aug. 13, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |
Fair value adjustments to earnout liabilities |  | $ 4,218 | $ 11,222 |
HEE [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash paid on acquisition | $ 7,000 |  |  |
Shares issued for acquired subsidiary | 34,626 |  |  |
Fair value of common stock issued | $ 500 |  |  |
Trading day period | 30 days |  |  |
Restrictions on sale or transfer for periods range | 6 months |  |  |
Fair value adjustments to earnout liabilities | $ 2,000 | (1,267) |  |
Revenue from acquired entity |  | 4,200 | 11,300 | $ 2,300
Income (loss) from acquired entity |  | $ (500) | $ 900 | $ 100
HEE [Member] | Thirty Trading Days [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of common stock issued | $ 500 |  |  |

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