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Goodwill and Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2017
Goodwill and Intangible Assets |
Schedule of acquired intangible assets |
|  | As of March 31, 2017 |
|  | Gross |  |  |  |  |  |  |  |  |  |  |
|  | Carrying |  | Accumulated |  | Net Carrying |  | Useful Lives |
(in thousands) |  | Amount |  | Amortization |  | Amount |  | (Years) |
Purchased technology |  | $ | 110,000 |  | $ | 110,000 |  | $ | — |  | 1.4 | to | 2.5 |
ETF issuer relationships |  |  | 950 |  |  | 481 |  |  | 469 |  |  | 9 |  |
ETF buyer relationships |  |  | 950 |  |  | 480 |  |  | 470 |  |  | 9 |  |
|  | $ | 111,900 |  | $ | 110,961 |  | $ | 939 |  |  |  |  |
|  | As of December 31, 2016 |
|  | Gross |  |  |  |  |  |  |  |  |  |  |
|  | Carrying |  | Accumulated |  | Net Carrying |  | Useful Lives |
(in thousands) |  | Amount |  | Amortization |  | Amount |  | (Years) |
Purchased technology |  | $ | 110,000 |  | $ | 110,000 |  | $ | — |  | 1.4 | to | 2.5 |
ETF issuer relationships |  |  | 950 |  |  | 454 |  |  | 496 |  |  | 9 |  |
ETF buyer relationships |  |  | 950 |  |  | 454 |  |  | 496 |  |  | 9 |  |
|  | $ | 111,900 |  | $ | 110,908 |  | $ | 992 |  |  |  |  |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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