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Employee Benefit Plans and Stock-based Compensation (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Weighted Average Grant Date Fair Value [Roll Forward]
Weighted-average grant date fair value of stock options granted (in dollars per share)	$ 1.79	$ 2.65	$ 3.11
Weighted average assumptions [Abstract]
Expected term	4 years	4 years	4 years
Volatility (in hundredths)	72.87%	69.84%	69.00%
Expected dividend (in hundredths)	0.00%	0.00%	0.00%
Risk-free interest rate (in hundredths)	0.57%	1.00%	2.04%
Retirement Savings Plan [Abstract]
Period after which all full time employees are eligible to participate in the savings plan	90 days
Maximum percentage of employer matching contribution if employees contribute at least 6% of base pay (in hundredths)	4.00%
Minimum percentage of employee contribution to get 4% of employer's contribution (in hundredths)	6.00%
Contributions to the retirement savings plans	$ 900,000	$ 610,000	$ 485,000
Common stock [Abstract]
Common stock reserved for future issuance	3,178,646
Exercise price ranges of options outstanding and exercisable [Abstract]
Options outstanding, shares (in shares)	2,727,000
Weighted-average Exercise Price (in dollars per share)	$ 3.28
Weighted-average Remaining Contractual Life	6 years 8 months 15 days
Options Vested and Excisable Shares (in shares)	1,595,000
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 2.88
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]
Total stock-based compensation	1,215,000	896,000	655,000
Tax effect on stock-based compensation	0	0	0
Net effect on net income	1,215,000	896,000	655,000
Shares used in computing basic net income per share (in shares)	32,144,000	31,872,000	31,008,000
Shares used in computing diluted net income per share (in shares)	32,865,000	33,061,000	32,512,000
Effect on basic net income per share (in dollars per share)	$ (0.04)	$ (0.03)	$ (0.02)
Effect on diluted net income per share (in dollars per share)	$ (0.04)	$ (0.03)	$ (0.02)
$1.18 - $1.38 [Member]
Exercise price ranges of options outstanding and exercisable [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 1.18
Range of exercise price, maximum (in dollars per share)	$ 1.38
Options outstanding, shares (in shares)	403,000
Weighted-average Exercise Price (in dollars per share)	$ 1.31
Weighted-average Remaining Contractual Life	1 year 5 months 26 days
Options Vested and Excisable Shares (in shares)	403,000
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 1.31
$1.40 - $1.40 [Member]
Exercise price ranges of options outstanding and exercisable [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 1.40
Range of exercise price, maximum (in dollars per share)	$ 1.40
Options outstanding, shares (in shares)	1,000
Weighted-average Exercise Price (in dollars per share)	$ 1.4
Weighted-average Remaining Contractual Life	2 years 2 months 12 days
Options Vested and Excisable Shares (in shares)	1,000
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 1.4
$1.59 - $1.59 [Member]
Exercise price ranges of options outstanding and exercisable [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 1.59
Range of exercise price, maximum (in dollars per share)	$ 1.59
Options outstanding, shares (in shares)	328,000
Weighted-average Exercise Price (in dollars per share)	$ 1.59
Weighted-average Remaining Contractual Life	6 years 3 months 14 days
Options Vested and Excisable Shares (in shares)	294,000
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 1.59
$1.88 - $1.91 [Member]
Exercise price ranges of options outstanding and exercisable [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 1.88
Range of exercise price, maximum (in dollars per share)	$ 1.91
Options outstanding, shares (in shares)	8,000
Weighted-average Exercise Price (in dollars per share)	$ 1.9
Weighted-average Remaining Contractual Life	1 year 8 months 26 days
Options Vested and Excisable Shares (in shares)	8,000
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 1.9
$2.04 - $2.04 [Member]
Exercise price ranges of options outstanding and exercisable [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 2.04
Range of exercise price, maximum (in dollars per share)	$ 2.04
Options outstanding, shares (in shares)	442,000
Weighted-average Exercise Price (in dollars per share)	$ 2.04
Weighted-average Remaining Contractual Life	6 years 9 months 25 days
Options Vested and Excisable Shares (in shares)	343,000
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 2.04
$2.91 - $2.91 [Member]
Exercise price ranges of options outstanding and exercisable [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 2.91
Range of exercise price, maximum (in dollars per share)	$ 2.91
Options outstanding, shares (in shares)	488,000
Weighted-average Exercise Price (in dollars per share)	$ 2.91
Weighted-average Remaining Contractual Life	9 years 10 months 5 days
Options Vested and Excisable Shares (in shares)	0
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 0
$3.11 - $4.09 [Member]
Exercise price ranges of options outstanding and exercisable [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 3.11
Range of exercise price, maximum (in dollars per share)	$ 4.09
Options outstanding, shares (in shares)	91,000
Weighted-average Exercise Price (in dollars per share)	$ 3.37
Weighted-average Remaining Contractual Life	3 years 5 months 22 days
Options Vested and Excisable Shares (in shares)	67,000
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 3.17
$4.79 - $4.79 [Member]
Exercise price ranges of options outstanding and exercisable [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 4.79
Range of exercise price, maximum (in dollars per share)	$ 4.79
Options outstanding, shares (in shares)	366,000
Weighted-average Exercise Price (in dollars per share)	$ 4.79
Weighted-average Remaining Contractual Life	8 years 9 months 25 days
Options Vested and Excisable Shares (in shares)	107,000
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 4.79
$4.81 - $5.61 [Member]
Exercise price ranges of options outstanding and exercisable [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 4.81
Range of exercise price, maximum (in dollars per share)	$ 5.61
Options outstanding, shares (in shares)	145,000
Weighted-average Exercise Price (in dollars per share)	$ 5.26
Weighted-average Remaining Contractual Life	6 years 10 months 5 days
Options Vested and Excisable Shares (in shares)	65,000
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 4.84
$5.83 - $7.82 [Member]
Exercise price ranges of options outstanding and exercisable [Abstract]
Range of exercise price, minimum (in dollars per share)	$ 5.83
Range of exercise price, maximum (in dollars per share)	$ 7.82
Options outstanding, shares (in shares)	455,000
Weighted-average Exercise Price (in dollars per share)	$ 6
Weighted-average Remaining Contractual Life	7 years 1 month 27 days
Options Vested and Excisable Shares (in shares)	307,000
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 6.01
Cost of revenue [Member]
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]
Total stock-based compensation	78,000	84,000	36,000
Selling, general and administrative [Member]
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]
Total stock-based compensation	1,000,000	766,000	562,000
Research and development [Member]
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]
Total stock-based compensation	137,000	46,000	57,000
Stock Options [Member]
Common stock [Abstract]
Common stock reserved for future issuance	2,726,695
Restricted Stock [Member]
Common stock [Abstract]
Common stock reserved for future issuance	238,723
1997 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)	5,423,583
Terms of award	P10Y
Number of shares available for grant (in shares)	1,928,994
1997 Stock Option Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, minimum	4 years
Award vesting rights	Options granted under the 1997 Plan generally vest 25% at the end of one year and 2.1% each month thereafter, with full vesting after four years.
1997 Stock Option Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period if vesting is based on a performance measure	5 years
2007 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance (in shares)	1,300,000
Terms of award	P10Y
Number of shares available for grant (in shares)	213,000
Common stock [Abstract]
Common stock reserved for future issuance	213,228
2007 Equity Incentive Plan [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, minimum	3 years
Award vesting rights	Stock options or stock appreciation rights generally shall not be fully vested over a period of less than three years from the date of grant
Number of options outstanding [Roll Forward]
Options outstanding, beginning of period (in shares)	2,380,000	2,280,000	2,880,000
Granted (in shares)	592,000	367,000	399,000
Exercised (in shares)	(136,000)	(251,000)	(876,000)
Canceled (in shares)	(109,000)	(16,000)	(123,000)
Options outstanding, end of period (in shares)	2,727,000	2,380,000	2,280,000	2,880,000
Options vested and expected to vest as of December 31, 2012 (in shares)	2,717,000
Options exercisable as of December 31, 2012 (in shares)	1,595,000
Weighted average exercise price [Roll Forward]
Options outstanding, beginning of period (in dollars per share)	$ 3.25	$ 3.10	$ 2.46
Granted (in dollars per share)	$ 3.32	$ 4.79	$ 5.93
Exercised (in dollars per share)	$ 2.17	$ 2.54	$ 1.71
Canceled and expired (in dollars per share)	$ 4.25	$ 27.98	$ 7.26
Options outstanding, end of period (in dollars per share)	$ 3.28	$ 3.25	$ 3.10	$ 2.46
Options vested and expected to vest as of December 31, 2011 (in dollars per share)	$ 3.28
Options exercisable as of December 31, 2011 (in dollars per share)	$ 2.88
Weighted average Remaining Contractual Life [Abstract]
Options outstanding, beginning of period	6 years 8 months 15 days	6 years 3 months	6 years 4 months 24 days	5 years 8 months 12 days
Options outstanding, end of period	6 years 8 months 15 days	6 years 3 months	6 years 4 months 24 days	5 years 8 months 12 days
Options vested and expected to vest, end of period	6 years 8 months 12 days
Option exercisable, end of period	5 years 1 month 27 days
Aggregate Intrinsic Value [Abstract]
Options outstanding, beginning of period	3,456,000	17,030,000	3,850,000
Options outstanding, end of period	1,353,000	3,456,000	17,030,000	3,850,000
Options vested and expected to vest, aggregate intrinsic value	1,352,000
Options exercisable, end of period	1,235,000
Intrinsic value of options exercised	392,000	1,600,000	4,300,000
Compensation costs related to unvested stock options not yet recognized	2,200,000
Value of estimated forfeitures	20,000
Weighted-average period of amortization	2 years 7 months 6 days
2007 Equity Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period, minimum	3 years
Vesting period if vesting is based on a performance measure	12 months
Award vesting rights	Restricted stock, restricted stock units, and performance awards generally shall not vest faster than over a three-year period (or a twelve-month period if vesting is based on a performance measure)
Shares [Roll Forward]
Non-vested, beginning of period (in shares)	223,127	218,405	170,660
Granted (in shares)	113,768	97,986	121,237
Vested (in shares)	(98,172)	(93,264)	(69,092)
Forfeited (in shares)			(4,400)
Non-vested, end of period (in shares)	238,723	223,127	218,405
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested, beginning of period (in dollars per share)	$ 4.47	$ 3.30	$ 1.21
Granted (in dollars per share)	$ 3.18	$ 5.21	$ 5.29
Vested (in dollars per share)	$ 3.42	$ 2.51	$ 1.48
Forfeited (in dollars per share)			$ 5.83
Non-vested, end of period (in dollars per share)	$ 4.27	$ 4.47	$ 3.30
Total fair value of restricted stock awards vested	336,000	234,000	102,000
Unrecognized compensation expense related to restricted stock awards	$ 867,000
Weighted average remaining contractual terms	2 years 8 months 12 days

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gross number of share options (or share units) granted during the period.

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Name:	us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration