Note 10 - Equity Incentive Plans (Tables)

9 Months Ended

Sep. 30, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

	Three Months Ended September 30,					Nine Months Ended September 30,
	2014			2013*			2014		2013
Dividend rate		—	%	—	%		—	%	—	%
Risk-free interest rate		2.0	%	—	%		2.0	%	0.9	%
Remaining contractual term (in years)		6.1		—			6		6.1
Expected volatility		40	%	—	%		40	%	50	%

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

	Three Months Ended September 30,				Nine Months Ended September 30,
	2014		2013		2014		2013
Cost of revenue—subscription	$	249	$	46	$	348	$	152
Cost of revenue—professional services and other		142		24		206		79
Research and development		314		57		442		184
Sales and marketing		391		68		563		221
General and administrative		731		181		1,187		458
Total stock-based compensation expense	$	1,827	$	376	$	2,746	$	1,094

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

				Options Outstanding
	Shares Available for Grant			Number of Shares			Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value(1)
Balance as of December 31, 2013		139			4,662		$	5.56		6.1	$	24,412
Increase in share authorized		2,700			—
Options granted		(987	)		987			12.05
RSU granted		(404	)		—
Options exercised		—			(312	)		3.98
Options forfeited		142			(142	)		7.09
RSU forfeited		3			—
Balance as of September 30, 2014		1,593			5,195		$	6.85		6.3	$	27,799
Vested and expected to vest—September 30, 2014					4,963		$	6.66		6.2	$	27,488
Vested—September 30, 2014					3,290		$	5.06		4.8	$	23,483

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

	Number of RSUs			Weighted- Average Fair Value per Share(1)
	(in thousands)
Balance as of December 31, 2013		224		$	12.20
Restricted stock units granted		404		$	12.06
Restricted stock units forfeited		(3	)	$	12.03
Balance as of September 30, 2014		625		$	12.11