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Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Intangible asset activity |  |
Net balance | $ 37,888 |
Additions-Acquisition | 16,100 |
Additions-Other | 143 |
Impairment | (478) |
Net foreign currency translation | (204) |
Amortization expense | (6,909) |
Net balance | 46,540 |
Intangible assets, net |  |
Balance at cost |  | $ 94,103
Accumulated amortization |  | (47,563)
Ending Balance | 37,888 | 46,540
Impairment charges | 500 |
Acquired Technology |  |
Intangible asset activity |  |
Net balance | 6,946 |
Additions-Acquisition | 5,900 |
Net foreign currency translation | (68) |
Amortization expense | (3,017) |
Net balance | 9,761 |
Intangible assets, net |  |
Balance at cost |  | 42,735
Accumulated amortization |  | (32,974)
Ending Balance | 6,946 | 9,761
Customer Relationships |  |
Intangible asset activity |  |
Net balance | 22,544 |
Additions-Acquisition | 10,000 |
Net foreign currency translation | (241) |
Amortization expense | (2,294) |
Net balance | 30,009 |
Intangible assets, net |  |
Balance at cost |  | 37,718
Accumulated amortization |  | (7,709)
Ending Balance | 22,544 | 30,009
Other |  |
Intangible asset activity |  |
Net balance | 8,398 |
Additions-Acquisition | 200 |
Additions-Other | 143 |
Impairment | (478) |
Net foreign currency translation | 105 |
Amortization expense | (1,598) |
Net balance | 6,770 |
Intangible assets, net |  |
Balance at cost |  | 13,650
Accumulated amortization |  | (6,880)
Ending Balance | $ 8,398 | $ 6,770

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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