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Employee Benefit Plans and Stock-based Compensation - Options Excerise prices (Details)
shares in Thousands
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Exercise price ranges of options outstanding and exercisable [Abstract]  
Options outstanding, shares (in shares) | shares 3,779
Weighted-average Exercise Price (in dollars per share) $ 2.97
Weighted-average Remaining Contractual Life 6 years 3 months 4 days
Options Vested and Exercisable Shares (in shares) | shares 2,237
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 3.42
$1.59 - $2.04  
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) $ 2.04
Options outstanding, shares (in shares) | shares 623
Weighted-average Exercise Price (in dollars per share) $ 1.83
Weighted-average Remaining Contractual Life 2 years 3 months 26 days
Options Vested and Exercisable Shares (in shares) | shares 623
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 1.83
$2.14 - $2.14  
Exercise price ranges of options outstanding and exercisable [Abstract]  
Range of exercise price, minimum (in dollars per share) 2.14
Range of exercise price, maximum (in dollars per share) $ 2.14
Options outstanding, shares (in shares) | shares 52
Weighted-average Exercise Price (in dollars per share) $ 2.14
Weighted-average Remaining Contractual Life 8 years 3 months 29 days
Options Vested and Exercisable Shares (in shares) | shares 21
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 2.14
$2.18 - $2.18  
Exercise price ranges of options outstanding and exercisable [Abstract]  
Range of exercise price, minimum (in dollars per share) 2.18
Range of exercise price, maximum (in dollars per share) $ 2.18
Options outstanding, shares (in shares) | shares 846
Weighted-average Exercise Price (in dollars per share) $ 2.18
Weighted-average Remaining Contractual Life 9 years 6 months
$2.29 - $2.29  
Exercise price ranges of options outstanding and exercisable [Abstract]  
Range of exercise price, minimum (in dollars per share) $ 2.29
Range of exercise price, maximum (in dollars per share) $ 2.29
Options outstanding, shares (in shares) | shares 200
Weighted-average Exercise Price (in dollars per share) $ 2.29
Weighted-average Remaining Contractual Life 8 years 5 months 1 day
Options Vested and Exercisable Shares (in shares) | shares 75
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 2.29
$2.36 - $2.36  
Exercise price ranges of options outstanding and exercisable [Abstract]  
Range of exercise price, minimum (in dollars per share) 2.36
Range of exercise price, maximum (in dollars per share) $ 2.36
Options outstanding, shares (in shares) | shares 383
Weighted-average Exercise Price (in dollars per share) $ 2.36
Weighted-average Remaining Contractual Life 7 years 2 months 1 day
Options Vested and Exercisable Shares (in shares) | shares 215
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 2.36
$2.47 - $2.47  
Exercise price ranges of options outstanding and exercisable [Abstract]  
Range of exercise price, minimum (in dollars per share) 2.47
Range of exercise price, maximum (in dollars per share) $ 2.47
Options outstanding, shares (in shares) | shares 399
Weighted-average Exercise Price (in dollars per share) $ 2.47
Weighted-average Remaining Contractual Life 8 years 5 months 23 days
Options Vested and Exercisable Shares (in shares) | shares 120
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 2.47
$2.51 - $2.51  
Exercise price ranges of options outstanding and exercisable [Abstract]  
Range of exercise price, minimum (in dollars per share) 2.51
Range of exercise price, maximum (in dollars per share) $ 2.51
Options outstanding, shares (in shares) | shares 20
Weighted-average Exercise Price (in dollars per share) $ 2.51
Weighted-average Remaining Contractual Life 9 years 3 months 29 days
Options Vested and Exercisable Shares (in shares) | shares 13
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 2.51
$2.91 - $2.91  
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) | shares 408
Weighted-average Exercise Price (in dollars per share) $ 2.91
Weighted-average Remaining Contractual Life 5 years 9 months 22 days
Options Vested and Exercisable Shares (in shares) | shares 329
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 2.91
$3.18 - $4.81  
Exercise price ranges of options outstanding and exercisable [Abstract]  
Range of exercise price, minimum (in dollars per share) 3.18
Range of exercise price, maximum (in dollars per share) $ 4.81
Options outstanding, shares (in shares) | shares 386
Weighted-average Exercise Price (in dollars per share) $ 4.72
Weighted-average Remaining Contractual Life 4 years 2 months 9 days
Options Vested and Exercisable Shares (in shares) | shares 384
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 4.73
$4.92 - $7.82  
Exercise price ranges of options outstanding and exercisable [Abstract]  
Range of exercise price, minimum (in dollars per share) 4.92
Range of exercise price, maximum (in dollars per share) $ 7.82
Options outstanding, shares (in shares) | shares 462
Weighted-average Exercise Price (in dollars per share) $ 5.87
Weighted-average Remaining Contractual Life 3 years 9 months 11 days
Options Vested and Exercisable Shares (in shares) | shares 457
Option Vested and Exercisable, Weighted-Average Exercise Price (in dollars per share) $ 5.87