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Stock Options (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Weighted Average Assumptions Used in Estimating Fair Value of Stock Options

		As of December 31,
		2017				2016				2015
Valuation assumptions:
Expected dividend yield			0	%			0	%			0	%
Expected volatility			39.37	%			41.82	%			56.74	%
Expected term (years)			6.06				6.07				5.42
Risk-free interest rate			1.9	%			1.6	%			1.7	%

Summary of Outstanding Stock Option Activity

Stock option activity during the periods indicated is as follows:

		Number of shares				Weighted average exercise price				Weighted average remaining contractual term
Balance at December 31, 2014			504,550			$	2.60				5.8
Granted			512,402				2.00				9.2
Exercised			(24,260	)			3.19				—
Expired/Forfeited			(236,000	)			2.77				—
Balance at December 31, 2015			756,692			$	2.10				7.6
Granted			359,319				2.60				9.4
Exercised			(58,155	)			2.36				3.5
Expired/Forfeited			(17,469	)			2.13				2.6
Balance at December 31, 2016			1,040,387			$	2.25				7.8
Granted			471,144				14.72				9.1
Exercised			(284,455	)			2.07				5.2
Expired/Forfeited			(23,449	)			8.22				—
Balance at December 31, 2017			1,203,627			$	7.06				8.1
Vested and exercisable at December 31, 2017			523,566			$	2.21				7.0
Vested and expected to vest at December 31, 2017			1,203,627			$	7.06				8.1

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- References

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- Definition

Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ 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 (d)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ 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 (f)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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