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Note 8 - Stockholders' Equity (Deficiency) (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Stock by Class [Table Text Block]

	Authorized				Issued and outstanding
	Number of shares
	December 31,				December 31,
	2015		2014		2015		2014
Stock of $0.001 par value:
Common stock		200,000,000		200,000,000		26,069,154		24,685,604

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

	Year ended December 31, 2015
	Number			Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average remaining contractual life (years)
Options outstanding at the beginning of the year		4,080,611		$	9.697	$	95,855		6.092
Granted		191,200		$	28.253
Exercised		(1,334,351	)	$	1.521
Forfeited		(154,900	)	$	25.265
Options outstanding at the end of the period		2,782,560		$	14.026	$	21,337		6.246
Vested and expected to vest		2,677,503		$	13.623	$	21,284		6.156
Options exercisable at the end of the period		1,794,249		$	8.841	$	20,496		5.035

	Year ended December 31, 2014
	Number			Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average remaining contractual life (years)
Options outstanding at the beginning of the year		3,233,235		$	4.033	$	65,723		5.700
Granted		1,111,940		$	25.077
Exercised		(213,174	)	$	1.663
Forfeited		(51,390	)	$	19.449
Options outstanding at the end of the period		4,080,611		$	9.697	$	95,855		6.092
Vested and expected to vest		3,965,741		$	9.318	$	94,581		6.000
Options exercisable at the end of the period		2,620,454		$	2.638	$	79,117		4.359

	Year ended December 31, 2013
	Number			Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average remaining contractual life (years)
Options outstanding at the beginning of the year		2,809,923		$	1.782	$	43,801		5.952
Granted		541,150		$	15.267
Exercised		(105,021	)	$	1.239
Forfeited		(12,817	)	$	13.998
Options outstanding at the end of the period		3,233,235		$	4.033	$	65,723		5.700
Vested and expected to vest		3,203,465		$	3.941	$	65,412		5.668
Options exercisable at the end of the period		2,550,694		$	1.473	$	58,377		4.799

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block]

Range of exercise price			Options outstanding as of December 31, 2015		Weighted average remaining contractual life (years)		Weighted average exercise price		Options exercisable as of December 31, 2015		Weighted average remaining contractual life (years)		Weighted average exercise price of options exercisable
$0.901	-	1.576		978,178		2.923	$	1.224		978,178		2.923	$	1.224
$6.230	-	8.800		145,693		5.920	$	6.786		137,391		5.895	$	6.785
	$12.470			378,149		7.177	$	12.470		261,065		7.159	$	12.470
$19.510	-	21.660		640,743		8.609	$	21.219		211,571		8.477	$	21.237
$22.010	-	24.230		309,222		8.298	$	22.293		127,326		8.280	$	22.365
	$29.880			154,200		9.148	$	29.880		—		0.000	$	0.000
	$39.86			176,375		8.227	$	39.860		78,718		8.227	$	39.860
				2,782,560		6.246	$	14.026		1,794,249		5.035	$	8.841

Range of exercise price			Options outstanding as of December 31, 2014		Weighted average remaining contractual life (years)		Weighted average exercise price		Options exercisable as of December 31, 2014		Weighted average remaining contractual life (years)		Weighted average exercise price of options exercisable
$0.070	-	0.901		594,591		2.504	$	0.728		594,591		2.504	$	0.728
$1.039	-	1.576		1,651,595		4.255	$	1.261		1,651,595		4.255	$	1.261
$6.230	-	8.800		174,222		6.886	$	6.724		135,318		6.815	$	6.739
	$12.470			413,680		8.175	$	12.470		184,504		8.152	$	12.470
$21.00	-	24.23		1,039,073		9.476	$	21.611		54,446		8.812	$	21.764
	$39.86			207,450		9.227	$	39.860		—		0.000	$	0.000
				4,080,611		6.092	$	9.697		2,620,454		4.359	$	2.638

Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Issuance date	Options for shares of common stock		Exercise price per share		Options exercisable		Exercisable through
	(number)				(number)
February 2013		3,000	$	12.470		2,125	February 2023
August 2013		5,000	$	21.140		2,917	August 2023
October 2013		823	$	24.230		479	October 2023
March 2014		14,438	$	39.860		6,422	March 2024
May 2014		8,700	$	22.010		3,444	May 2024
August 2014		219	$	21.000		354	August 2024
November 2014		12,000	$	21.660		3,250	November 2024
May 2015		5,250	$	19.510		—	May 2025
		49,430				18,991

Issuance date	Options for shares of common stock		Exercise price per share		Options exercisable		Exercisable through
	(number)				(number)
December 2006		15,000	$	0.901		15,000	December 2016
February 2013		4,000	$	12.470		1,832	February 2023
August 2013		5,000	$	21.140		1,665	August 2023
October 2013		1,250	$	24.230		363	October 2023
March 2014		16,450	$	39.860		-	March 2024
May 2014		8,700	$	22.010		-	May 2024
August 2014		36,250	$	21.000		-	August 2024
November 2014		12,000	$	21.660		-	November 2024
		98,650				18,860

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

	Number of Shares Underlying Outstanding Restricted Stock Units			Weighted- Average Grant Date Fair Value
Outstanding as of January 1, 2015		27,470		$	21.00
Granted		685,065		$	23.30
Vested		(36,789	)	$	19.90
Forfeited		(32,240	)	$	23.56
Unvested as of December 31, 2015		643,506		$	23.38

	Number of Shares Underlying Outstanding Restricted Stock Units			Weighted- Average Grant Date Fair Value
Outstanding as of January 1, 2014		-		$	-
Granted		31,905		$	21.00
Vested		(4,435	)	$	21.00
Forfeited		-		$	-
Unvested as of December 31, 2014		27,470		$	21.00

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

	Year ended December 31,
	2015		2014		2013
Cost of revenues	$	419	$	192	$	39
Research and development		1,954		1,198		551
Sales and marketing		3,041		2,478		841
General and administrative		2,380		796		357
Total	$	7,794	$	4,664	$	1,788

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
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-URI http://asc.fasb.org/extlink&oid=27011957&loc=d3e177068-122764

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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

+ Details

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

+ References + Details