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Quarterly Financial Results (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product sales | $ 13,613 |  | $ 14,169 |  | $ 14,323 |  | $ 14,863 |  | $ 18,611 |  | $ 19,020 |  | $ 20,062 |  | $ 15,382 |  | $ 56,968 | $ 73,075 | $ 76,213
Service sales | 25,365 |  | 26,281 |  | 26,126 |  | 25,348 |  | 25,319 |  | 26,826 |  | 25,904 |  | 24,998 |  | 103,120 | 103,047 | 108,421
Cost of Goods Sold | 8,062 |  | 9,578 |  | 9,295 |  | 10,539 |  | 11,674 |  | 11,001 |  | 12,989 |  | 10,670 |  | 37,474 | 46,334 | 47,404
Cost of Services | 12,956 |  | 13,374 |  | 13,094 |  | 13,268 |  | 13,140 |  | 13,576 |  | 13,259 |  | 12,991 |  | 52,692 | 52,966 | 54,816
Operating Expenses | 19,085 |  | 19,299 |  | 19,428 |  | 20,874 |  | 19,384 |  | 18,256 |  | 20,411 |  | 20,093 |  |  |  |
Operating Income (Loss) | (1,125) |  | (1,801) |  | (1,368) |  | (4,470) |  | (268) |  | 3,013 |  | (693) |  | (3,374) |  | (8,764) | (1,322) | 3,208
Net loss | $ (1,685) |  | $ (2,438) |  | $ (2,026) |  | $ (4,885) |  | $ (6,783) |  | $ 2,863 |  | $ (806) |  | $ (2,791) |  | $ (11,034) | $ (7,517) | $ 2,253
Net (loss) income per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ (0.10) | [1] | $ (0.15) | [1] | $ 0 | [1] | $ (0.30) | [1] | $ (0.43) | [1] | $ 0.18 | [1] | $ 0 | [1] | $ (0.18) | [1] | $ (0.67) | $ (0.47) | $ 0.14
Diluted (in dollars per share) | $ (0.10) | [1] | $ (0.15) | [1] | $ 0 | [1] | $ (0.30) | [1] | $ (0.43) | [1] | $ 0.18 | [1] | $ 0 | [1] | $ (0.18) | [1] | $ (0.67) | $ (0.47) | $ 0.14
[1] | 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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