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Quarterly Financial Results (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of quarterly financial information | Financial information for interim periods was as follows:
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
| (in thousands, except per share amounts)
2018 |  |  |  |  |  |  |
Product sales | $ | 13,992 |  |  | $ | 16,162 |  |  | $ | 16,367 |  |  | $ | 16,756 |
Service sales | 26,109 |  |  | 27,230 |  |  | 27,150 |  |  | 26,995 |
Cost of product sales | 8,923 |  |  | 10,094 |  |  | 9,767 |  |  | 10,726 |
Cost of service sales | 13,816 |  |  | 15,498 |  |  | 15,376 |  |  | 15,900 |
Operating expenses | 20,542 |  |  | 18,987 |  |  | 19,294 |  |  | 19,002 |
Loss from operations | (3,180 | ) |  | (1,187 | ) |  | (920 | ) |  | (1,877 | )
Net loss | $ | (3,893 | ) |  | $ | (1,343 | ) |  | $ | (1,174 | ) |  | $ | (1,822 | )
Net loss per share (a): |  |  |  |  |  |  |
Basic | $ | (0.23 | ) |  | $ | (0.08 | ) |  | $ | (0.07 | ) |  | $ | (0.11 | )
Diluted | $ | (0.23 | ) |  | $ | (0.08 | ) |  | $ | (0.07 | ) |  | $ | (0.11 | )
2017 |  |  |  |  |  |  |
Product sales | $ | 14,863 |  |  | $ | 14,323 |  |  | $ | 14,169 |  |  | $ | 13,613 |
Service sales | 25,348 |  |  | 26,126 |  |  | 26,281 |  |  | 25,365 |
Cost of product sales | 10,539 |  |  | 9,295 |  |  | 9,578 |  |  | 8,062 |
Cost of service sales | 13,268 |  |  | 13,094 |  |  | 13,374 |  |  | 12,956 |
Operating expenses | 20,874 |  |  | 19,428 |  |  | 19,299 |  |  | 19,085 |
Loss from operations | (4,470 | ) |  | (1,368 | ) |  | (1,801 | ) |  | (1,125 | )
Net loss | $ | (4,885 | ) |  | $ | (2,026 | ) |  | $ | (2,438 | ) |  | $ | (1,685 | )
Net loss per share (a): |  |  |  |  |  |  |
Basic | $ | (0.30 | ) |  | $ | (0.12 | ) |  | $ | (0.15 | ) |  | $ | (0.10 | )
Diluted | $ | (0.30 | ) |  | $ | (0.12 | ) |  | $ | (0.15 | ) |  | $ | (0.10 | )
(a) | Net (loss) income per share is computed independently for each of the quarters. Therefore, the net (loss) income per share for the four quarters may not equal the annual net (loss) income per share data.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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