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Note 8 - Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Stock by Class [Table Text Block]

	Authorized				Issued and outstanding
	Number of shares
	December 31,				December 31,
	2017		2016		2017		2016
Stock of $0.001 par value:
Common stock		200,000,000		200,000,000		28,146,162		26,821,762

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

	Year ended December 31, 2017
	Number			Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average remaining contractual life (years)
Options outstanding at the beginning of the year		2,388,348		$	15.243	$	30,025		5.861
Granted		-		$	-
Exercised		(832,270	)	$	13.031
Forfeited		(99,793	)	$	19.930
Options outstanding at the end of the period		1,456,285		$	16.172	$	47,152		4.906
Vested and expected to vest		1,456,285		$	16.172	$	47,152		4.906
Options exercisable at the end of the period		1,262,206		$	15.052	$	42,282		4.595

	Year ended December 31, 2016
	Number			Weighted average exercise price		Aggregate intrinsic value (in thousands)		Weighted average remaining contractual life (years)
Options outstanding at the beginning of the year		2,782,560		$	14.026	$	21,337		6.246
Granted		135,000		$	16.870
Exercised		(445,535	)	$	5.901
Forfeited		(83,677	)	$	27.126
Options outstanding at the end of the period		2,388,348		$	15.243	$	30,025		5.861
Vested and expected to vest		2,331,800		$	15.074	$	29,689		5.806
Options exercisable at the end of the period		1,752,416		$	12.583	$	26,473		5.119

	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

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, 2017		Weighted average remaining contractual life (years)		Weighted average exercise price		Options exercisable as of December 31, 2017		Weighted average remaining contractual life (years)		Weighted average exercise price of options exercisable
$1.039	-	1.576		401,476		1.383	$	1.295		401,476		1.383	$	1.295
$6.230	-	8.800		55,929		3.908	$	7.125		55,929		3.908	$	7.125
$12.470	-	16.870		228,001		5.820	$	13.435		200,917		5.508	$	12.972
$19.510	-	21.660		374,257		6.606	$	21.207		284,671		6.567	$	21.201
$22.010	-	24.230		170,815		6.193	$	22.292		144,967		6.182	$	22.342
	$29.880			117,829		7.145	$	29.880		74,758		7.145	$	29.880
	$39.860			107,978		6.225	$	39.860		99,488		6.225	$	39.860
				1,456,285		4.906	$	16.172		1,262,206		4.595	$	15.052

Range of exercise price			Options outstanding as of December 31, 2016		Weighted average remaining contractual life (years)		Weighted average exercise price		Options exercisable as of December 31, 2016		Weighted average remaining contractual life (years)		Weighted average exercise price of options exercisable
$0.901	-	1.576		710,562		2.482	$	1.317		710,562		2.482	$	1.317
$6.230	-	8.800		89,373		4.963	$	6.953		89,373		4.963	$	6.953
$12.470	-	16.870		442,507		7.078	$	13.812		279,863		6.163	$	12.470
$19.510	-	21.660		546,959		7.622	$	21.205		307,302		7.558	$	21.200
$22.010	-	24.230		295,513		7.299	$	22.278		191,891		7.289	$	22.316
	$29.880			154,200		8.145	$	29.880		70,684		8.145	$	29.880
	$39.860			149,234		7.225	$	39.860		102,741		7.225	$	39.860
				2,388,348		5.861	$	15.243		1,752,416		5.119	$	12.583

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		1,500	$	12.470		1,500	February 2023
August 2013		4,188	$	21.140		4,083	August 2023
March 2014		7,953	$	39.860		7,163	March 2024
May 2014		6,075	$	22.010		5,317	May 2024
November 2014		7,107	$	21.660		4,897	November 2024
May 2015		2,000	$	19.510		1,292	May 2025
February 2016		2,500	$	16.870		1,145	February 2026
		31,323				25,397

Issuance date	Options for shares of common stock		Exercise price per share		Options exercisable		Exercisable through
	(number)				(number)
February 2013		1,500	$	12.470		1,344	February 2023
August 2013		4,188	$	21.140		3,104	August 2023
October 2013		750	$	24.230		547	October 2023
March 2014		13,100	$	39.860		8,187	March 2024
May 2014		6,850	$	22.010		3,704	May 2024
November 2014		10,246	$	21.660		4,364	November 2024
May 2015		5,250	$	19.510		1,750	May 2025
February 2016		2,500	$	16.870		—	February 2026
		44,384				23,000

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, 2017		1,399,127		$	19.96
Granted		1,295,653		$	31.58
Vested		(407,458	)	$	21.89
Forfeited		(269,201	)	$	22.75
Unvested as of December 31, 2017		2,018,121		$	27.32

	Number of Shares Underlying Outstanding Restricted Stock Units			Weighted- Average Grant Date Fair Value
Outstanding as of January 1, 2016		643,506		$	23.38
Granted		1,038,044		$	19.67
Vested		(199,074	)	$	22.82
Forfeited		(83,349	)	$	20.21
Unvested as of December 31, 2016		1,399,127		$	19.96

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

	Year ended December 31,
	2017		2016		2015
Cost of revenues	$	1,078	$	699	$	419
Research and development		5,209		3,052		1,954
Sales and marketing		8,542		6,104		3,041
General and administrative		5,006		3,083		2,380
Total	$	19,835	$	12,938	$	7,794

- 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
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+ 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