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Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Net income (loss) attributable to common shareholders: |  |  |  |
Net income (loss) attributable to common shareholders | $ (187) | $ 2,568 | $ 1,973 | $ 4,637
Basic weighted-average shares outstanding (in shares) | 18,876,000 | 18,723,000 | 18,861,000 | 18,708,000
Basic earnings (loss) per share attributable to common shareholders: |  |  |  |
Basic earnings (loss) per share attributable to common shareholders (in dollars per share) | $ (0.01) | $ 0.14 | $ 0.10 | $ 0.25
Diluted shares outstanding |  |  |  |
Basic weighted-average shares outstanding (in shares) | 18,876,000 | 18,723,000 | 18,861,000 | 18,708,000
Stock-based awards (in shares) | 0 | 217,000 | 390,000 | 238,000
Diluted weighted-average shares outstanding (in shares) | 18,876,000 | 18,940,000 | 19,251,000 | 18,946,000
Diluted earnings (loss) per share attributable to common shareholders: |  |  |  |
Diluted earnings (loss) per share attributable to common shareholders (in dollars per share) | $ (0.01) | $ 0.14 | $ 0.10 | $ 0.24
Dilutive shares excluded from diluted-per-share amounts: |  |  |  |
Stock options (in shares) |  | 86,000 | 371,000 | 86,000
Anti-dilutive shares excluded from diluted-per-share amounts: |  |  |  |
Stock options (in shares) | 2,444,000 | 1,445,000 | 1,363,000 | 1,445,000
Stock options |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Potentially dilutive securities (in shares) | 1,540 |  | 1,540 |
RSUs |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Potentially dilutive securities (in shares) | 904 |  | 904 |

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