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Intangible Assets | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The components of intangible assets were as follows (in thousands):
|  | June 30, 2018 |  | December 31, 2017
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Developed technology |  | $ | 2,460 |  |  | $ | (1,653 | ) |  | $ | 807 |  |  | $ | 2,460 |  |  | $ | (1,478 | ) |  | $ | 982 |
Customer relationships |  | 520 |  |  | (489 | ) |  | 31 |  |  | 520 |  |  | (437 | ) |  | 83 |
Domain names |  | 50 |  |  | (47 | ) |  | 3 |  |  | 50 |  |  | (42 | ) |  | 8 |
Total |  | $ | 3,030 |  |  | $ | (2,189 | ) |  | $ | 841 |  |  | $ | 3,030 |  |  | $ | (1,957 | ) |  | $ | 1,073 |
Amortization expense for intangible assets was $0.1 million and $0.2 million for the three and six months ended June 30, 2018, respectively, and $0.1 million and $0.2 million for each of the three and six months ended June 30, 2017, respectively. As of June 30, 2018, the expected future amortization expense for intangible assets was as follows (in thousands):
Period |  | Expected Future Amortization Expense
2018 |  | $ | 210 |
2019 |  | 351 |
2020 |  | 280 |
Total |  | $ | 841 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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