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Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2018
Intangible asset activity |  |  |
Net balance |  | $ 37,888 |
Additions-Acquisition |  | 16,108 |
Additions-Other |  | 86 |
Impairment |  | (478) |
Net foreign currency translation |  | 1 |
Amortization expense |  | (4,467) |
Net balance | $ 49,138 | 49,138 |
Intangible assets, net |  |  |
Balance at cost |  |  | $ 94,223
Accumulated amortization |  |  | (45,085)
Ending Balance | 49,138 | 37,888 | 49,138
Impairment charges | 500 | 500 |
Acquired Technology |  |  |
Intangible asset activity |  |  |
Net balance |  | 6,946 |
Additions-Acquisition |  | 5,858 |
Net foreign currency translation |  | (1) |
Amortization expense |  | (2,035) |
Net balance | 10,768 | 10,768 |
Intangible assets, net |  |  |
Balance at cost |  |  | 43,151
Accumulated amortization |  |  | (32,383)
Ending Balance | 10,768 | 6,946 | 10,768
Customer Relationships |  |  |
Intangible asset activity |  |  |
Net balance |  | 22,544 |
Additions-Acquisition |  | 10,051 |
Net foreign currency translation |  | 2 |
Amortization expense |  | (1,212) |
Net balance | 31,385 | 31,385 |
Intangible assets, net |  |  |
Balance at cost |  |  | 37,884
Accumulated amortization |  |  | (6,499)
Ending Balance | 31,385 | 22,544 | 31,385
Other |  |  |
Intangible asset activity |  |  |
Net balance |  | 8,398 |
Additions-Acquisition |  | 199 |
Additions-Other |  | 86 |
Impairment |  | (478) |
Amortization expense |  | (1,220) |
Net balance | 6,985 | 6,985 |
Intangible assets, net |  |  |
Balance at cost |  |  | 13,188
Accumulated amortization |  |  | (6,203)
Ending Balance | $ 6,985 | $ 8,398 | $ 6,985

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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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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 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 + Details
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