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Note 4 - Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2015

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

	Period ended June 30, 2015 (unaudited)
	Number			Average exercise price		Aggregate intrinsic value (in thousands)		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		(202,771	)	$	2.936
Forfeited		(100,802	)	$	26.269

Options outstanding at the end of the period		3,968,238		$	10.515	$	50,482		5.870

Vested and expected to vest		3,874,985		$	10.200	$	50,352		5.794

Options exercisable at the end of the period		2,649,977		$	4.414	$	47,928		4.364

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
Unvested balance - January 1, 2015		27,470		$	21.00
Granted		474,865		$	25.02
Vested		(11,050	)	$	20.14
Forfeited		(9,840	)	$	22.29
Unvested balance - June 30, 2015		481,445		$	24.96

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 June 30, 2015		Weighted average remaining contractual life (years)		Weighted average exercise price		Options exercisable as of June 30, 2015		Weighted average remaining contractual life (years)		Weighted average exercise price of options exercisable

$0.070	-	0.901		467,436		2.422	$	0.883		467,436		2.422	$	0.883
$1.039	-	1.576		1,630,672		3.777	$	1.263		1,630,672		3.777	$	1.263
$6.230	-	8.800		149,818		6.415	$	6.772		128,372		6.357	$	6.777
	$12.470			382,669		7.679	$	12.470		209,815		7.657	$	12.470
	$19.510			30,000		9.871	$	19.510		-		-	$	-
$21.000	-	24.230		969,834		8.987	$	21.609		154,477		8.635	$	21.873
	$29.880			154,200		9.652	$	29.880		-		-	$	-
	$39.860			183,609		8.732	$	39.860		59,205		8.732	$	39.860

				3,968,238		5.870	$	10.515		2,649,977		4.364	$	4.414

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Period ended June 30, 2015
	unaudited

Expected dividend yield		0	%
Expected volatility		65	%
Risk-free interest rate		2.00	%
Expected term (years)		6.25

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

	Options for shares of common stock		Exercise price per share		Options exercisable		Exercisable through
	(number)				(number)

February 2013		3,500	$	12.470		1,833	February 2023
August 2013		5,000	$	21.140		2,292	August 2023
October 2013		1,084	$	24.230		355	October 2023
March 2014		15,575	$	39.860		5,141	March 2024
May 2014		8,700	$	22.010		2,356	May 2024
August 2014		1,250	$	21.000		-	August 2024
November 2014		12,000	$	21.660		-	November 2024
May 2015		6,250	$	19.510		-	May 2025

		53,359				11,977

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(unaudited)				(unaudited)
	(in thousands)				(in thousands)

Cost of revenues	$	111	$	46	$	202	$	66
Research and development		544		272		1,011		471
Sales and marketing		702		519		1,439		859
General and administrative		605		141		995		228

Total	$	1,962	$	978	$	3,647	$	1,624

- 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