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Quarterly Financial Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ 170,761 | $ 160,088 | $ 176,122
Operating expenses | $ 19,002 | $ 19,294 | $ 18,987 | $ 20,542 | $ 19,085 | $ 19,299 | $ 19,428 | $ 20,874 |  |  |
Loss from operations | (1,877) | (920) | (1,187) | (3,180) | (1,125) | (1,801) | (1,368) | (4,470) | (7,164) | (8,764) | (1,322)
Net loss | $ (1,822) | $ (1,174) | $ (1,343) | $ (3,893) | $ (1,685) | $ (2,438) | $ (2,026) | $ (4,885) | $ (8,232) | $ (11,034) | $ (7,517)
Net (loss) income per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.11) | $ (0.07) | $ (0.08) | $ (0.23) | $ (0.10) | $ (0.15) | $ (0.12) | $ (0.30) |  | $ (0.67) | $ (0.47)
Diluted (in dollars per share) | $ (0.11) | $ (0.07) | $ (0.08) | $ (0.23) | $ (0.10) | $ (0.15) | $ (0.12) | $ (0.30) | $ (0.48) | $ (0.67) | $ (0.47)
Product |  |  |  |  |  |  |  |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 16,756 | $ 16,367 | $ 16,162 | $ 13,992 | $ 13,613 | $ 14,169 | $ 14,323 | $ 14,863 |  |  |
Cost of product and service sales | 10,726 | 9,767 | 10,094 | 8,923 | 8,062 | 9,578 | 9,295 | 10,539 |  |  |
Service |  |  |  |  |  |  |  |  |  |  |
Interim Period, Costs Not Allocable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | 26,995 | 27,150 | 27,230 | 26,109 | 25,365 | 26,281 | 26,126 | 25,348 |  |  |
Cost of product and service sales | $ 15,900 | $ 15,376 | $ 15,498 | $ 13,816 | $ 12,956 | $ 13,374 | $ 13,094 | $ 13,268 |  |  |

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