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Stockholders' Equity - Stock Option Activity Under Equity-Based Plans (Details)	9 Months Ended
	Sep. 30, 2018 shares
Number of Shares
Balance (in shares)	1,296,863
Exercised (in shares)	(540,292)
Forfeited (in shares)	(17,846)
Balance (in shares)	738,725
Exercisable (in shares)	710,467

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Number of share options (or share units) exercised during the current period.

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