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Business Acquisitions - Additional Information (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2015 | Apr. 21, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Apr. 29, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Difference between fair value and carrying value as a gain |  |  | $ 0 |  | $ 0 | $ 3,443 | $ 0 |
Avantec [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, amount withheld for idemnification | $ 1,800 |  |  |  |  |  |  |
Percentage of minority interest |  |  |  |  |  |  |  | 15.00%
Carrying book value of previous equity interest | $ 1,300 |  |  |  |  |  |  |
Fair value of equity investment |  |  |  | $ 4,700 |  |  |  |
Difference between fair value and carrying value as a gain |  |  |  | 3,400 |  |  |  |
Mach4 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payment to acquire business, amount in cash after adjustments |  | $ 17,200 |  |  |  |  |  |
Amount placed in escrow fund for business acquisition |  | $ 2,700 |  |  |  |  |  |
Period after closing date to settle indemnification and other claims |  | 18 months |  |  |  |  |  |
Mach4 [Member] | Developed technology [Member] | Income Approach Valuation Technique [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Discount rate |  | 17.50% |  |  |  |  |  |
Royalty rate |  | 5.00% |  |  |  |  |  |
Mach4 [Member] | Trade names [Member] | Income Approach Valuation Technique [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Royalty rate |  | 2.00% |  |  |  |  |  |
Mach4 [Member] | Minimum [Member] | Developed technology [Member] | Income Approach Valuation Technique [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Discount rate |  | 1.50% |  |  |  |  |  |
Avantec [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Period after closing date to settle indemnification and other claims | 18 months |  |  |  |  |  |  |
Percentage of interest acquired | 85.00% |  |  |  |  |  |  |
Payment to acquire business, in cash | $ 12,000 |  |  |  |  |  |  |
Business acquisition, potential earn-out payment | $ 5,600 |  |  |  |  |  |  |
Difference between fair value and carrying value as a gain |  |  |  | $ 3,400 |  |  |  |
Avantec [Member] | Trade names [Member] | Income Approach Valuation Technique [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Royalty rate | 1.00% |  |  |  |  |  |  |
Avantec [Member] | Payable After December 31, 2015 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, potential earn-out payment | $ 3,000 |  |  |  |  |  |  |
Avantec [Member] | Payable After December 31, 2016 [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business acquisition, potential earn-out payment | $ 3,000 |  |  |  |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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