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Note 4 - Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2016

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

	Three Months Ended March 31, 2016
	(unaudited)

Expected dividend yield		0	%
Expected volatility		62	%
Risk-free interest rate		1.42	%
Expected term (years)		6.25

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

	Three Months Ended March 31, 2016 (unaudited)
	Number			Average exercise price		Aggregate intrinsic value (in thousands)		Average remaining contractual life (years)

Options outstanding as of January 1, 2016		2,782,560		$	14.026	$	21,337		6.246
Granted		135,000		$	16.870
Exercised		(15,181	)	$	5.848
Forfeited		(23,391	)	$	25.560

Options outstanding as of March 31, 2016		2,878,988		$	14.119	$	20,507		6.169

Vested and expected to vest		2,783,465		$	11.971	$	20,471		6.095

Options exercisable at the end of the period		1,911,497		$	9.873	$	19,736		5.019

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 March 31, 2016		Weighted average remaining contractual life (years)		Weighted average exercise price		Options exercisable as of March 31, 2016		Weighted average remaining contractual life (years)		Weighted average exercise price of options exercisable

$0.901	-	$1.576		974,178		2.682	$	1.225		974,178		2.682	$	1.225
$6.230	-	8.800		136,650		5.670	$	6.806		133,289		5.659	$	6.807
$12.470	-	16.870		510,698		7.710	$	13.633		281,231		6.910	$	12.470
$19.510	-	21.660		622,311		8.363	$	21.218		247,216		8.247	$	21.243
$22.010	-	24.230		308,524		8.050	$	22.289		145,959		8.034	$	22.349
	$29.880			154,200		8.899	$	29.880		41,772		8.899	$	29.880
	$39.860			172,427		7.978	$	39.860		87,852		7.978	$	39.860

				2,878,988		6.169	$	14.119		1,911,497		5.019	$	9.873

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		3,000	$	12.470		2,313	February 2023
August 2013		5,000	$	21.140		3,229	August 2023
October 2013		750	$	24.230		453	October 2023
March 2014		13,980	$	39.860		7,105	March 2024
May 2014		8,700	$	22.010		3,988	May 2024
November 2014		12,000	$	21.660		4,000	November 2024
May 2015		5,250	$	19.510		-	May 2025
February 2016		3,000	$	16.870		-	February 2026

		51,680				21,088

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, 2016		643,506		$	23.38
Granted		719,250		$	16.87
Vested		(72,785	)	$	28.10
Forfeited		(17,925	)	$	18.91
Unvested balance – March 31, 2016		1,272,046		$	22.62

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

	Three Months Ended March 31,
	2016		2015
	(unaudited)
	(in thousands)

Cost of revenues	$	146	$	91
Research and development		665		467
Sales and marketing		1,175		737
General and administrative		638		390

Total	$	2,624	$	1,685

- 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