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Revenue from Contracts with Customers (Tables) | 6 Months Ended
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Jun. 30, 2019
Revenue from Contract with Customer [Abstract] |
Schedule of disaggregation of revenue | Revenue and operating expenses (excluding depreciation and amortization) disaggregated by revenue source are as follows (in thousands):
| Three months ended June 30, |  | Six months ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Revenue: |  |  |  |  |  |  |
Products | $ | 33,632 |  |  | $ | 38,213 |  |  | $ | 75,703 |  |  | $ | 78,142 |
Services | 1,060 |  |  | 1,333 |  |  | 2,246 |  |  | 2,473 |
| $ | 34,692 |  |  | $ | 39,546 |  |  | $ | 77,949 |  |  | $ | 80,615 |
Operating expenses (excluding depreciation and amortization): |  |  |  |  |  |
Products | $ | 37,798 |  |  | $ | 34,062 |  |  | $ | 81,877 |  |  | $ | 69,247 |
Services | 508 |  |  | 1,482 |  |  | 1,027 |  |  | 2,952 |
| $ | 38,306 |  |  | $ | 35,544 |  |  | $ | 82,904 |  |  | $ | 72,199 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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