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Acquisitions (HEE) - Additional Information (Detail) - HEE [Member] - USD ($) |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 13, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |
Cash paid on acquisition | $ 7,000,000 |  |  |
Shares issued for acquired subsidiary | 34,626 |  |  |
Fair value of common stock issued | $ 500,000 |  |  |
Earn out expenses | $ 2,000,000 | $ 0 |  | $ 0
Trading day period | 30 days |  |  |
Restrictions on sale or transfer for periods range | 9 months |  |  |
First year estimated earn-out payable |  | 700,000 |  |
Remainder of estimated earn-out payable |  | 1,300,000 |  |
Revenue from acquired entity |  | 9,200,000 | $ 400,000 |
Net income from acquired entity |  | $ 1,100,000 | $ 0 |
Thirty Trading Days [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Fair value of common stock issued | $ 500,000 |  |  |

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