Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Stock Options Vested and Expected to Vest) (Details)

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Stockholders' Equity (Stock Options Vested and Expected to Vest) (Details) (Stock Options [Member], USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Stock Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vested, Number of Options (Shares) 4,422,877
Expected to vest, Number of Options (Shares) 1,478,396
Total vested and expected to vest, Number of Options (Shares) 5,901,273
Vested, Weighted Average Exercise Price per Share (dollars per share) $ 7.21
Expected to vest, Weighted Average Exercise Price per Share (dollars per share) $ 5.37
Total vested and expected to vest, Weighted Average Exercise Price per Share (dollars per share) $ 6.75
Vested, Weighted Average Remaining Contractual Term (years) 3 years 4 months 20 days
Expected to vest, Weighted Average Remaining Contractual Term (years) 8 years 9 months 10 days
Total vested and expected to vest, Weighted Average Remaining Contractual Term (years) 4 years 8 months 26 days
Vested, Aggregate Intrinsic Value $ 657
Expected to vest, Aggregate Intrinsic Value 0
Total vested and expected to vest, Aggregate Intrinsic Value $ 657