Basis of Presentation and Summary of Significant Accounting Policies - Earnings (Loss) Per Share (Details) - shares |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
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| Summary of computation of basic and diluted net income (loss) per share | ||||
| Weighted average shares outstanding (shares) | 21,148,080 | 21,070,678 | 21,188,938 | 21,006,718 |
| Dilutive potential common shares: | ||||
| Restricted stock (shares) | 83,427 | 79,222 | 68,997 | 140,340 |
| Stock options (shares) | 1,247,940 | 1,019,342 | 1,166,777 | 980,461 |
| 2019 convertible senior notes (shares) | 0 | 1,334,357 | 923,650 | 1,118,456 |
| Warrants (shares) | 1,572,969 | 47,646 | 1,081,209 | 15,882 |
| Shares used to compute diluted income per share (shares) | 24,052,416 | 23,551,245 | 24,429,571 | 23,261,857 |
| Potentially dilutive shares excluded from calculation due to anti-dilutive effect (shares) | 3,125,815 | 255,101 | 1,788,709 | 2,531,219 |
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References No definition available.
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- References No definition available.
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). No definition available.
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- Definition Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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