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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
	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.

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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.

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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.

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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.

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