Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2015

Stockholders' Equity [Abstract]

Stock-Based Compensation Expenses Included In The Condensed Consolidated Statements Of Operations

	For the Year Ended December 31,
	2015		2014		2013
Sales and marketing	$	869	$	1,031	$	1,113
Research and development		210		104		122
General and administrative		3,362		2,330		2,772
	$	4,441	$	3,465	$	4,007

Schedule Of Valuation Assumptions Used For Stock Options And ESPP Plans

	2015		2014		2013
Risk-free interest rate:
Time-based stock options	1.52	%	1.61	%	1.02	%
Performance-based stock options	N/A		N/A		1.22
ESPP	0.07		0.04		0.06
Volatility factor of the market price of the Company's common stock:
Time-based stock options	52.08	%	57.96	%	64.12	%
Performance-based stock options	N/A		N/A		63.20
ESPP	53.73		42.50		37.36
Weighted-average expected life (years):
Time-based stock options	5.30		5.00		5.10
Performance-based stock options	N/A		N/A		5.04
ESPP	0.25		0.25		0.25
Dividend yield	0.00	%	0.00	%	0.00	%

Schedule Of Stock Option Activity

	Options Outstanding
			Weighted-	Weighted-
			Average	Average
	Number		Exercise	Remaining	Aggregate
	of		Price Per	Contractual	Intrinsic
	Shares		Share	Term (Years)	Value
Balance as of January 1, 2013	5,998	$	4.05	6.06	$	5,575
Options forfeited	(966)		5.45
Options granted	1,637		4.76
Options exercised	(574)		2.82
Balance as of December 31, 2013	6,095	$	4.14	5.66	$	7,199
Options forfeited	(705)		5.10
Options granted	1,740		4.85
Options exercised	(1,233)		4.43
Balance as of December 31, 2014	5,897	$	4.17	6.08	$	27,066
Options forfeited	(262)		5.77
Options granted	1,414		8.83
Options exercised	(1,022)		4.48
Balance as of December 31, 2015	6,027	$	5.14	6.07	$	24,462
Vested and expected to vest after December 31, 2015	5,564	$	4.97	5.84	$	23,556
Exercisable as of December 31, 2015	3,600	$	3.91	4.35	$	19,030

Schedule Of RSU Activity

	RSUs and PSUs
	Outstanding
	Number	Aggregate
	of	Intrinsic
	Shares	Value
Balance as of January 1, 2013	260	$	1,121
Awarded	170
Vested/Released	(39)
Forfeited	(23)
Balance as of December 31, 2013	368	$	1,857
Awarded	7
Vested/Released	(212)
Forfeited	(4)
Balance as of December 31, 2014	159	$	1,393
Awarded	688
Vested/Released	(105)
Forfeited	—
Balance as of December 31, 2015	742	$	6,822
Vested and expected to vest after December 31, 2015	552	$	5,077
Exercisable as of December 31, 2015 (Vested and deferred)	—		—