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Stock Option Plans (Tables)

12 Months Ended

Dec. 31, 2016

Stock Option Plans

Summary of stock option activity

					Options Outstanding
		Shares Available for Grant			Number of Options			Weighted- Average Exercise Price
Balance at December 31, 2015			2,559,499			784,136		$	4.09
Additional shares authorized			1,496,001
Options granted			(1,813,400	)		1,813,400			15.09
Options exercised			—			(13,454	)		0.28
Options forfeited			233,500			(233,500	)		11.35
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Balance at December 31, 2016			2,475,600			2,350,582		$	11.88
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Summary of information about stock options outstanding

Options Outstanding at December 31, 2016

Options Vested at December 31, 2016

Exercise Price

Number

Weighted Average Remaining Contractual Life (in Years)

Weighted Average Exercise Price

Number

Weighted Average Remaining Contractual Life (in Years)

Weighted Average Exercise Price

$0.28

419,682

8.46

$

0.28

159,732

8.44

$

0.28

$4.65

144,500

8.81

$

4.65

42,449

8.81

$

4.65

$6.75

5,000

8.87

$

6.75

1,438

8.87

$

6.75

$13.34 - 16.37

1,781,400

9.42

$

15.21

193,867

9.18

$

15.14

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2,350,582

9.21

$

11.88

397,486

8.84

$

8.02

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Options Outstanding at December 31, 2015

Options Vested at December 31, 2015

Exercise Price

Number

Weighted Average Remaining Contractual Life (in Years)

Weighted Average Exercise Price

Number

Weighted Average Remaining Contractual Life (in Years)

Weighted Average Exercise Price

$0.28 - $4.65

629,136

9.54

$

1.28

9,637

9.06

$

0.28

$6.75 - $15.79

155,000

10.00

$

15.50

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784,136

9.63

$

4.09

9,637

9.06

$

0.28

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Schedule of options outstanding and exercisable that had vested or were expected to vest

        Options outstanding and exercisable that had vested or were expected to vest at December 31, 2016 were as follows:

		Number of shares			Weighted Average Exercise Price			Weighted Average Remaining Contractual Life (years)			Aggregate Intrinsic Value (in thousands)
Vested			397,486		$	8.02			8.84		$	2,660
Expected to vest			1,953,096		$	12.66			9.27		$	4,869

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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
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-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 2
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