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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 01, 2015 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Amortizable intangible assets |  |  |  |
Gross Carrying Amount |  | $ 34,846 |  | $ 34,846
Accumulated Amortization |  | (23,817) |  | (22,959)
Net Carrying Amount |  | 11,029 |  | 11,887
Amortization expense |  | 858 | $ 834 |
Estimated future amortization expense |  |  |  |
Remainder of 2016 |  | 2,547 |  |
2017 |  | 3,342 |  |
2018 |  | 2,529 |  |
2019 |  | 1,742 |  |
2020 |  | 869 |  |
Patents |  |  |  |
Amortizable intangible assets |  |  |  |
Gross Carrying Amount |  | 10,823 |  | 10,823
Accumulated Amortization |  | (7,266) |  | (6,872)
Net Carrying Amount |  | 3,557 |  | 3,951
Patents | Skyhook |  |  |  |
Amortizable intangible assets |  |  |  |
Useful life | 3 years 6 months |  |  |
Tradename |  |  |  |
Amortizable intangible assets |  |  |  |
Gross Carrying Amount |  | 2,838 |  | 2,838
Accumulated Amortization |  | (1,248) |  | (1,154)
Net Carrying Amount |  | 1,590 |  | 1,684
Capitalized software |  |  |  |
Amortizable intangible assets |  |  |  |
Gross Carrying Amount |  | 10,973 |  | 10,973
Accumulated Amortization |  | (10,886) |  | (10,857)
Net Carrying Amount |  | 87 |  | 116
Capitalized software | Skyhook | Minimum |  |  |  |
Amortizable intangible assets |  |  |  |
Useful life | 3 years |  |  |
Capitalized software | Skyhook | Maximum |  |  |  |
Amortizable intangible assets |  |  |  |
Useful life | 5 years |  |  |
Customer relationships |  |  |  |
Amortizable intangible assets |  |  |  |
Gross Carrying Amount |  | 10,212 |  | 10,212
Accumulated Amortization |  | (4,417) |  | (4,076)
Net Carrying Amount |  | $ 5,795 |  | $ 6,136
Tradename and customer relationships [member] | Skyhook |  |  |  |
Amortizable intangible assets |  |  |  |
Useful life | 5 years 6 months |  |  |

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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=56944662&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=26713463&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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