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Employee Benefit Plans and Stock-based Compensation (Details) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
$1.18 - $1.34 [Member]
Dec. 31, 2013
$1.59 - $1.59 [Member]
Dec. 31, 2013
$1.91 - $1.91 [Member]
Dec. 31, 2013
$2.04 - $2.04 [Member]
Dec. 31, 2013
$2.36 - $2.36 [Member]
Dec. 31, 2013
$2.91 - $2.91 [Member]
Dec. 31, 2013
$3.14 - $4.09 [Member]
Dec. 31, 2013
$4.79 - $4.79 [Member]
Dec. 31, 2013
$4.81 - $5.61 [Member]
Dec. 31, 2013
$5.83 - $7.82 [Member]
Dec. 31, 2013
Cost of revenue [Member]
Dec. 31, 2012
Cost of revenue [Member]
Dec. 31, 2011
Cost of revenue [Member]
Dec. 31, 2013
Selling, general and administrative [Member]
Dec. 31, 2012
Selling, general and administrative [Member]
Dec. 31, 2011
Selling, general and administrative [Member]
Dec. 31, 2013
Research and development [Member]
Dec. 31, 2012
Research and development [Member]
Dec. 31, 2011
Research and development [Member]
Dec. 31, 2013
Stock Options [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2013
1997 Stock Option Plan [Member]
Dec. 31, 2013
1997 Stock Option Plan [Member]
Stock Options [Member]
Dec. 31, 2013
1997 Stock Option Plan [Member]
Restricted Stock [Member]
Dec. 31, 2013
2007 Equity Incentive Plan [Member]
May 31, 2013
2007 Equity Incentive Plan [Member]
Dec. 31, 2013
2007 Equity Incentive Plan [Member]
Stock Options [Member]
Dec. 31, 2012
2007 Equity Incentive Plan [Member]
Stock Options [Member]
Dec. 31, 2011
2007 Equity Incentive Plan [Member]
Stock Options [Member]
Dec. 31, 2010
2007 Equity Incentive Plan [Member]
Stock Options [Member]
Dec. 31, 2013
2007 Equity Incentive Plan [Member]
Restricted Stock [Member]
Dec. 31, 2012
2007 Equity Incentive Plan [Member]
Restricted Stock [Member]
Dec. 31, 2011
2007 Equity Incentive Plan [Member]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                        
Number of shares authorized for issuance (in shares)                                                 5,423,583     1,300,000 2,000,000              
Vesting period, minimum                                                   4 years       3 years       3 years    
Terms of award                                                 10 years     10 years                
Number of shares available for grant (in shares)                                                 1,928,994     1,786,000                
Vesting period if vesting is based on a performance measure                                                     5 years             12 months    
Vesting percentage as the end of first year (in hundredths)                                                   25.00%                    
Vesting percentage per month after first year (in hundredths)                                                   2.10%                    
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.       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       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)    
Number of options outstanding [Roll Forward]                                                                        
Options outstanding, beginning of period (in shares)                                                           2,727,000 2,380,000 2,280,000        
Granted (in shares)                                                           488,000 592,000 367,000        
Exercised (in shares)                                                           (331,000) (136,000) (251,000)        
Canceled (in shares)                                                           (213,000) (109,000) (16,000)        
Options outstanding, end of period (in shares)                                                           2,671,000 2,727,000 2,380,000 2,280,000      
Options vested and expected to vest as of December 31, 2012 (in shares)                                                           2,649,000            
Options exercisable as of December 31, 2012 (in shares)                                                           1,666,000            
Weighted average exercise price [Roll Forward]                                                                        
Options outstanding, beginning of period (in dollars per share)                                                           $ 3.28 $ 3.25 $ 3.10        
Granted (in dollars per share)                                                           $ 2.38 $ 3.32 $ 4.79        
Exercised (in dollars per share)                                                           $ 1.62 $ 2.17 $ 2.54        
Canceled and expired (in dollars per share)                                                           $ 3.60 $ 4.25 $ 27.98        
Options outstanding, end of period (in dollars per share)                                                           $ 3.29 $ 3.28 $ 3.25 $ 3.10      
Options vested and expected to vest as of December 31, 2011 (in dollars per share)                                                           $ 3.30            
Options exercisable as of December 31, 2011 (in dollars per share)                                                           $ 3.34            
Weighted average Remaining Contractual Life [Abstract]                                                                        
Options outstanding, beginning of period                                                           6 years 8 months 16 days 6 years 8 months 16 days 6 years 3 months 6 years 4 months 24 days      
Options outstanding, end of period                                                           6 years 8 months 16 days 6 years 8 months 16 days 6 years 3 months 6 years 4 months 24 days      
Options vested and expected to vest, end of period                                                           6 years 8 months 5 days            
Option exercisable, end of period                                                           5 years 3 months 29 days            
Aggregate Intrinsic Value [Abstract]                                                                        
Options outstanding, beginning of period                                                           $ 1,353,000 $ 3,456,000 $ 17,030,000        
Options outstanding, end of period                                                           893,000 1,353,000 3,456,000 17,030,000      
Options vested and expected to vest, aggregate intrinsic value                                                           889,000            
Options exercisable, end of period                                                           786,000            
Intrinsic value of options exercised                                                           331,000 392,000 1,600,000        
Compensation costs related to unvested stock options not yet recognized                                                           1,500,000            
Value of estimated forfeitures                                                           88,000            
Weighted-average period of amortization                                                           2 years 8 months 12 days            
Shares [Roll Forward]                                                                        
Non-vested, beginning of period (in shares)                                                                   238,723 223,127 218,405
Granted (in shares)                                                                   103,636 113,768 97,986
Vested (in shares)                                                                   (85,127) (98,172) (93,264)
Forfeited (in shares)                                                                   (16,000)    
Non-vested, end of period (in shares)                                                                   241,232 238,723 223,127
Weighted Average Grant Date Fair Value [Roll Forward]                                                                        
Non-vested, beginning of period (in dollars per share)                                                                   $ 4.27 $ 4.47 $ 3.30
Granted (in dollars per share)                                                                   $ 2.52 $ 3.18 $ 5.21
Vested (in dollars per share)                                                                   $ 4.56 $ 3.42 $ 2.51
Forfeited (in dollars per share)                                                                   $ 4.03    
Non-vested, end of period (in dollars per share)                                                                   $ 3.44 $ 4.27 $ 4.47
Total fair value of restricted stock awards vested                                                                   389,000 336,000 234,000
Unrecognized compensation expense related to restricted stock awards                                                                   681,000    
Weighted average remaining contractual terms                                                                   2 years 6 months    
Weighted-average grant date fair value of stock options granted (in dollars per share) $ 1.09 $ 1.79 $ 2.65                                                                  
Weighted average assumptions [Abstract]                                                                        
Expected term 4 years 4 years 4 years                                                                  
Volatility (in hundredths) 59.20% 72.87% 69.84%                                                                  
Expected dividend (in hundredths) 0.00% 0.00% 0.00%                                                                  
Risk-free interest rate (in hundredths) 0.98% 0.57% 1.00%                                                                  
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 110,000 900,000 610,000                                                                  
Common stock [Abstract]                                                                        
Common stock reserved for future issuance 4,697,264                                           2,670,528 241,232       1,785,504                
Exercise price ranges of options outstanding and exercisable [Abstract]                                                                        
Range of exercise price, minimum (in dollars per share)       $ 1.18 $ 1.59 $ 1.91 $ 2.04 $ 2.36 $ 2.91 $ 3.14 $ 4.79 $ 4.81 $ 5.83                                              
Range of exercise price, maximum (in dollars per share)       $ 1.34 $ 1.59 $ 1.91 $ 2.04 $ 2.36 $ 2.91 $ 4.09 $ 4.79 $ 5.61 $ 7.82                                              
Options outstanding, shares (in shares) 2,671,000     216,000 296,000 4,000 333,000 428,000 444,000 42,000 341,000 142,000 425,000                                              
Weighted-average Exercise Price (in dollars per share) $ 3.29     $ 1.26 $ 1.59 $ 1.91 $ 2.04 $ 2.36 $ 2.91 $ 3.66 $ 4.79 $ 5.27 $ 5.96                                              
Weighted-average Remaining Contractual Life 6 years 8 months 16 days     1 year 2 months 1 day 5 years 4 months 2 days 1 year 10 months 13 days 5 years 9 months 25 days 9 years 10 months 2 days 8 years 10 months 6 days 5 years 0 months 22 days 7 years 7 months 2 days 5 years 8 months 8 days 5 years 7 months 10 days                                              
Options Vested and Excisable Shares (in shares) 1,666,000     216,000 296,000 4,000 333,000 0 120,000 28,000 189,000 97,000 383,000                                              
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 3.34     $ 1.26 $ 1.59 $ 1.91 $ 2.04 $ 0 $ 2.91 $ 3.53 $ 4.79 $ 5.11 $ 5.96                                              
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]                                                                        
Total stock-based compensation 1,277,000 1,215,000 896,000                     22,000 78,000 84,000 1,091,000 1,000,000 766,000 164,000 137,000 46,000                            
Tax effect on stock-based compensation 0 0 0                                                                  
Net effect on net income $ 1,277,000 $ 1,215,000 $ 896,000                                                                  
Shares used in computing basic net income per share (in shares) 32,700,000 32,144,000 31,872,000                                                                  
Shares used in computing diluted net income per share (in shares) 32,700,000 32,865,000 33,061,000                                                                  
Effect on basic net income per share (in dollars per share) $ (0.04) $ (0.04) $ (0.03)                                                                  
Effect on diluted net income per share (in dollars per share) $ (0.04) $ (0.04) $ (0.03)