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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of total revenue accounted for percentage-of-completion revenue, less than |  |  |  |  |  |  |  |  | 0.10% | 0.10% | 0.10%
Product sales as a percentage of total revenue |  |  |  |  |  |  |  |  | 95.00% | 95.00% | 95.00%
Revenue | $ 43,449 | $ 53,709 | $ 39,546 | $ 41,069 | $ 55,299 | $ 61,167 | $ 65,875 | $ 60,765 | $ 177,773 | $ 243,106 | $ 188,233
Operating expenses (excluding depreciation and amortization) |  |  |  |  |  |  |  |  | 159,808 | 188,744 | 143,983
Products |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 172,412 | 237,211 | 182,294
Operating expenses (excluding depreciation and amortization) |  |  |  |  |  |  |  |  | 152,846 | 182,330 | 140,108
Services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 5,361 | 5,895 | 5,939
Operating expenses (excluding depreciation and amortization) |  |  |  |  |  |  |  |  | $ 6,962 | $ 6,414 | $ 3,875

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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