Stock Plans and Stock-Based Compensation - Schedule of Stock Option Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options outstanding, Beginning Balance	1,884,425	1,821,722
Stock options outstanding, Granted	1,096,881	292,204
Stock options outstanding, Exercised	(497,175)	(163,968)
Stock options outstanding, Forfeited	(43,841)	(65,533)
Stock options outstanding, Ending Balance	2,440,290	1,884,425
Weighted average exercise price, Beginning Balance	$ 10.02	$ 8.68
Weighted average exercise price, Granted	22.84	14.75
Weighted average exercise price, Exercised	5.77	4.30
Weighted average exercise price, Forfeited	15.60	8.03
Weighted average exercise price, Ending Balance	$ 16.55	$ 10.02

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Gross number of share options (or share units) granted during the period.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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

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