Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Common Stock Reserve for Future Issuance) (Details)

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Stockholders' Equity (Common Stock Reserve for Future Issuance) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Warrants to purchase common stock $ 260 $ 266
Total common stock reserved for future issuance 11,118 10,223
Restricted stock units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options 958 546
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options 6,133 7,904
Reserved for future grants $ 3,767 $ 1,507