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Stock-Based Compensation (Details 5) (Restricted stock units [Member], USD $)
12 Months Ended
Dec. 31, 2012
Restricted stock units [Member]
 
Unvested restricted stock units  
Number of RSUs, Beginning balance 357,542
Number of RSUs, Granted 1,358,000
Number of RSUs, Vested and exercised (171,062)
Number of RSUs, Cancelled (10,280)
Number of RSUs, Ending balance 1,534,200
Weighted-average grant date fair value per RSU, Beginning balance $ 10.56
Weighted-average grant date fair value per RSU, Granted $ 1.10
Weighted-average grant date fair value per RSU, Vested and exercised $ 11.30
Weighted-average grant date fair value per RSU, Cancelled $ 12.17
Weighted-average grant date fair value per RSU, Ending balance $ 2.10