Annual report pursuant to Section 13 and 15(d)

Balance Sheets and Statements of Operations Details (Interest Expense and Other, Net) (Details)

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Balance Sheets and Statements of Operations Details (Interest Expense and Other, Net) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Income and Expenses [Abstract]      
Interest expense $ 0 $ 0 $ 529
Foreign exchange losses 348 706 314
Re-measurement of redeemable convertible preferred stock warrant liabilities 0 0 677
Other (22) (31) (321)
Interest expense and other, net $ 326 $ 675 $ 1,199