Employee Benefit Plans and Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2013

Employee Benefit Plans and Stock-based Compensation [Abstract]

The following summarizes our stock option activity under the 2007 Plan, and the related weighted average exercise price within each category for each of the years ended December 31, 2011, 2012, and 2013 (in thousands, except per share data):

Stock Options	Number of Options Outstanding			Weighted‑ average Exercise Price		Weighted‑ average Remaining Contractual Life		Aggregate Intrinsic Value
						(in years)
Balance as of January 1, 2011		2,280		$	3.10		6.40	$	17,030
Granted		367			4.79
Exercised		(251	)		2.54
Canceled and expired		(16	)		27.98
Balance as of December 31, 2011		2,380			3.25		6.25	$	3,456
Granted		592			3.32
Exercised		(136	)		2.17
Canceled and expired		(109	)		4.25
Balance as of December 31, 2012		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
Options vested and expected to vest as of December 31, 2013		2,649		$	3.30		6.68	$	889
Options exercisable as of December 31, 2013		1,666		$	3.34		5.33	$	786

Options outstanding and exercisable

The options outstanding and exercisable as of December 31, 2013 were in the following exercise price ranges (in thousands, except per share data):

	Options Outstanding as of December 31, 2013						Options Vested and Exercisable as of December 31, 2013
Range of Exercise Price	Shares		Weighted‑average Exercise Price		Weighted‑average Remaining Contractual Life		Shares		Weighted‑Average Exercise Price
$1.18 ‑ $1.34		216	$	1.26		1.17		216	$	1.26
$1.59 ‑ $1.59		296	$	1.59		5.34		296	$	1.59
$1.91 ‑ $1.91		4	$	1.91		1.87		4	$	1.91
$2.04 ‑ $2.04		333	$	2.04		5.82		333	$	2.04
$2.36 ‑ $2.36		428	$	2.36		9.84		0	$	0.00
$2.91 ‑ $2.91		444	$	2.91		8.85		120	$	2.91
$3.14 ‑ $4.09		42	$	3.66		5.06		28	$	3.53
$4.79 ‑ $4.79		341	$	4.79		7.59		189	$	4.79
$4.81 ‑ $5.61		142	$	5.27		5.69		97	$	5.11
$5.83 ‑ $7.82		425	$	5.96		5.61		383	$	5.96
		2,671	$	3.29		6.71		1,666	$	3.34

Restricted stock awards

A summary of activity related to restricted stock awards for the years ended December 31, 2011, 2012 and 2013 is presented below:

Stock Awards	Shares			Weighted‑Average Grant Date Fair Value
Non-vested as of January 1, 2011		218,405		$	3.30
Granted		97,986		$	5.21
Vested		(93,264	)	$	2.51
Non-vested as of December 31, 2011		223,127		$	4.47
Granted		113,768		$	3.18
Vested		(98,172	)	$	3.42
Non-vested as of December 31, 2012		238,723		$	4.27
Granted		103,636		$	2.52
Vested		(85,127	)	$	4.56
Forfeited		(16,000	)	$	4.03
Non-vested as of December 31, 2013		241,232		$	3.44

Common stock reserved for future issuance

The following number of shares of common stock were reserved and available for future issuance at December 31, 2013:


Options outstanding			2,670,528
Restricted stock awards outstanding			241,232
Stock available for future grant: 2007 Equity Incentive Plan			1,785,504
Total			4,697,264

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):

	Years Ended December 31,
	2013			2012			2011
Stock‑based compensation in the form of employee stock options and restricted stock, included in:
Cost of revenue	$	22		$	78		$	84
Selling, general and administrative		1,091			1,000			766
Research and development		164			137			46
Total stock‑based compensation		1,277			1,215			896
Tax effect on stock‑based compensation		—			—			—
Net effect on net income	$	1,277		$	1,215		$	896
Shares used in computing basic net income per share		32,700			32,144			31,872
Shares used in computing diluted net income per share		32,700			32,865			33,061
Effect on basic net income per share	$	(0.04	)	$	(0.04	)	$	(0.03	)
Effect on diluted net income per share	$	(0.04	)	$	(0.04	)	$	(0.03	)

Weighted-average assumptions

The fair value of options granted was estimated at the date of grant using the following weighted‑average assumptions:

	Years Ended December 31,
	2013			2012			2011
Expected term (in years)		4.0			4.0			4.0
Volatility		59.20	%		72.87	%		69.84	%
Expected dividend		0	%		0	%		0	%
Risk-free interest rate		0.98	%		0.57	%		1.00	%