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Basis of Presentation and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) - shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Summary of computation of basic and diluted net income (loss) per share |  |  |  |
Weighted average shares outstanding (shares) | 21,211,877 | 21,012,611 | 21,209,467 | 20,974,738
Dilutive potential common shares: |  |  |  |
Restricted stock (shares) | 59,605 | 156,054 | 61,782 | 170,900
Stock options (shares) | 1,132,781 | 967,533 | 1,126,196 | 961,021
2019 convertible senior notes (shares) | 1,051,852 | 1,079,702 | 1,385,475 | 1,010,505
Warrants (shares) | 981,807 | 0 | 835,329 | 0
Shares used to compute diluted income per share (shares) | 24,437,922 | 23,215,900 | 24,618,249 | 23,117,164
Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) | 2,091,908 | 3,811,813 | 1,120,156 | 3,761,440

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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