Employee Benefit Plans and Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2015

Employee Benefit Plans and Stock-based Compensation

The following table summarizes the stock option transactions for each of the years ended December 31, 2013, 2014 and 2015 (in thousands, except per share data):


				Weighted-
				average
		Weighted-		Remaining
	Number of	average		Contractual	Aggregate
	Options	Exercise		Life	Intrinsic
Stock Options	Outstanding	Price		(in years)	Value

Balance as of January 1, 2013	2,727		3.28	6.71	$	1,353
Granted	488		2.38
Exercised	(331)		1.62
Canceled and expired	(213)		3.60
Balance as of December 31, 2013	2,671		3.29	6.71	$	893
Granted	712		2.40
Exercised	(111)		1.21
Canceled and expired	(74)		5.18
Balance as of December 31, 2014	3,198	$	3.12	6.95	$	1,247
Granted	866		2.19
Exercised	(119)		1.38
Canceled and expired	(166)		3.03
Balance as of December 31, 2015	3,779	$	2.97	6.26	$	764
Options vested as of December 31, 2015 and unvested options expected to vest, net of forfeitures	3,691	$	2.99	6.19	$	742
Options exercisable as of December 31, 2015	2,237	$	3.42	4.41	$	453

Options outstanding and exercisable

The options outstanding and exercisable as of December 31, 2015 were in the following exercise price ranges (in thousands, except per share data):


									Options Vested and
					Options Outstanding as of				Exercisable as of
					December 31, 2015				December 31, 2015
								Weighted‑average
Range of						Weighted‑average		Remaining		Weighted‑Average
Exercise Price					Shares	Exercise Price		Contractual Life	Shares	Exercise Price
$	1.59	-	$	2.04	623	$	1.83	2.32	623	$	1.83
$	2.14	-	$	2.14	52	$	2.14	8.33	21	$	2.14
$	2.18	-	$	2.18	846	$	2.18	9.50	—	$	—
$	2.29	-	$	2.29	200	$	2.29	8.42	75	$	2.29
$	2.36	-	$	2.36	383	$	2.36	7.17	215	$	2.36
$	2.47	-	$	2.47	399	$	2.47	8.48	120	$	2.47
$	2.51	-	$	2.51	20	$	2.51	9.33	13	$	2.51
$	2.91	-	$	2.91	408	$	2.91	5.81	329	$	2.91
$	3.18	-	$	4.81	386	$	4.72	4.19	384	$	4.73
$	4.92	-	$	7.82	462	$	5.87	3.78	457	$	5.87
					3,779	$	2.97	6.26	2,237	$	3.42

Restricted stock awards


		Weighted-Average
		Grant Date
Stock Awards	Shares	Fair Value
Non-vested as of January 1, 2013	239	$	4.27
Granted	104	$	2.52
Vested	(85)	$	4.56
Forfeited	(16)	$	4.03
Non-vested as of December 31, 2013	241	$	3.44
Granted	121	$	2.34
Vested	(101)	$	4.01
Forfeited	—		—
Non-vested as of December 31, 2014	261	$	2.71
Granted	547	$	2.42
Vested	(215)	$	2.81
Forfeited	(47)	$	2.47
Non-vested as of December 31, 2015	546	$	2.39

Common stock reserved for future issuance


Options outstanding		3,779
Restricted stock awards outstanding		546
Stock available for future grant: 2015 Equity Incentive Plan		2,822
Total		7,147

Compensation costs related to stock-based awards

The following table summarizes compensation costs related to our stock‑based compensation awards (in thousands, except per share data):


	Year Ended
	December 31,
	2015		2014		2013
Stock‑based compensation in the form of employee stock options and restricted stock, included in:
Cost of revenue	$	20	$	18	$	22
Selling, general and administrative		1,148		938		1,091
Research and development		181		173		164
Total stock-based compensation		1,349		1,129		1,277
Tax effect on stock-based compensation		—		—		—
Net effect on net income (loss)	$	1,349	$	1,129	$	1,277
Shares used in computing basic net income per share		32,183		32,452		32,700
Shares used in computing diluted net income per share		32,183		32,452		32,700
Effect on basic net income per share	$	(0.04)	$	(0.03)	$	(0.04)
Effect on diluted net income per share	$	(0.04)	$	(0.03)	$	(0.04)

Weighted-average assumptions


	Year Ended
	December 31,
	2015		2014		2013
Expected term (in years)	3.9		4.1		4
Volatility	51.1	%	63.2	%	59.2	%
Expected dividend	—	%	—	%	—	%
Risk-free interest rate	1.75	%	1.85	%	0.98	%