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Intangible Assets | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets |
4. | Intangible Assets
The following table summarizes information relating to the Company’s definite-lived intangible assets:
|  |  |  |  | September 30, 2018 |  |  | December 31, 2017 |
|  | Useful |  |  | Gross |  |  |  |  |  | Net |  |  | Gross |  |  |  |  |  | Net |
|  | Lives |  |  | Carrying |  |  | Accumulated |  |  | Carrying |  |  | Carrying |  |  | Accumulated |  |  | Carrying |
|  | (Years) |  |  | Amount |  |  | Amortization |  |  | Amount |  |  | Amount |  |  | Amortization |  |  | Amount |
Intangibles (amount in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Patent |  |  | 1-17 |  |  | $ | 710 |  |  | $ | (330 | ) |  | $ | 380 |  |  | $ | 657 |  |  | $ | (306 | ) |  | $ | 351 |
Software |  |  | 3 |  |  |  | 410 |  |  |  | (403 | ) |  |  | 7 |  |  |  | 410 |  |  |  | (398 | ) |  |  | 12 |
Customer relationships |  |  | 12 |  |  |  | 3,370 |  |  |  | (2,430 | ) |  |  | 940 |  |  |  | 3,370 |  |  |  | (2,246 | ) |  |  | 1,124 |
Permit |  |  | 10 |  |  |  | 545 |  |  |  | (523 | ) |  |  | 22 |  |  |  | 545 |  |  |  | (483 | ) |  |  | 62 |
Total |  |  |  |  |  | $ | 5,035 |  |  | $ | (3,686 | ) |  | $ | 1,349 |  |  | $ | 4,982 |  |  | $ | (3,433 | ) |  | $ | 1,549 |
The intangible assets noted above are amortized on a straight-line basis over their estimated useful lives with the exception of customer relationships which are being amortized using an accelerated method. The Company has only one definite-lived permit that is subject to amortization. The following table summarizes the expected amortization over the next five years for our definite-lived intangible assets (including the one definite-lived permit):
|  | Amount |
Year |  | (In thousands) |
2018 (remaining) |  | $ | 84 |
2019 |  |  | 256 |
2020 |  |  | 220 |
2121 |  |  | 199 |
2022 |  |  | 173 |
Amortization expense relating to the definite-lived intangible assets as discussed above was $84,000 and $253,000 for the three and nine months ended September 30, 2018, respectively, and $93,000 and $281,000 for the three and nine months ended September 30, 2017, respectively.

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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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