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Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Income (Loss) per Share (Details) - USD ($) shares in Thousands, $ 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
Numerator: |  |  |  |  |  |  |  |  |  |  |
(Loss) income from continuing operations | $ (1,858) | $ (1,773) | $ (3,114) | $ (4,522) | $ (7,805) | $ (3,177) | $ (3,916) | $ (1,977) | $ (11,267) | $ (16,875) | $ 9,471
Loss from discontinued operations | 0 | 0 | 0 | 0 | 0 | 0 | 0 | (12) | 0 | (12) | (691)
Net (loss) income | $ (1,858) | $ (1,773) | $ (3,114) | $ (4,522) | $ (7,805) | $ (3,177) | $ (3,916) | $ (1,989) | $ (11,267) | $ (16,887) | $ 8,780
Denominator: |  |  |  |  |  |  |  |  |  |  |
Basic weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 11,806 | 11,673 | 10,413
Potential common shares from options and warrants (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 339
Diluted weighted average shares (in shares) |  |  |  |  |  |  |  |  | 11,806 | 11,673 | 10,752

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