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Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2015

Stock Incentive Plans.

Summary of the Company's stock option activity

Shares

Weighted- Average Exercise Price

Weighted Average Remaining Contractual Term (years)

Aggregate Intrinsic Value (in thousands)

Outstanding at December 31, 2014

1,226,140

$

4.14

8.15

$

6,579

Granted

606,942

11.42

Exercised

(40,548

)

2.24

Cancelled or forfeited

(68,980

)

6.49

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Outstanding at December 31, 2015

1,723,554

$

6.66

7.92

$

4,267

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Exercisable at December 31, 2015

795,501

$

3.47

6.77

$

3,562

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Vested or expected to vest at December 31, 2015

1,607,456

$

6.40

7.84

$

4,223

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Schedule of assumptions made based on the Black-Scholes option pricing model

		Year Ended December 31,
		2015			2014			2013
Weighted-average expected volatility			73.6 - 86.8	%		75.2 - 83.4	%		75.0 - 81.5	%
Expected term (in years)			6.17 - 10.00			6.25 - 10.00			6.25 - 10.00
Risk free interest rate			0.92 - 2.45	%		1.71 - 3.01	%		0.92 - 2.03	%
Expected dividend yield			0	%		0	%		0	%

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ 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)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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=6415400&loc=d3e5070-113901

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