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Divestiture and Discontinued Operations - Summary of financial information of discontinued operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Summarized financial results |  |
(Provision for) benefit from income taxes | $ 100 | $ 400
PAR Springer Miller Systems Inc |  |
Assets |  |
Other current assets | 0 | 462
Assets of discontinued operations | 0 | 462
Summarized financial results |  |
Income (loss) from discontinued operations before income taxes | 284 | (1,131)
(Provision for) benefit from income taxes | (60) | 411
Income (loss) from discontinued operations, net of taxes | $ 224 | $ (720)

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