Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Earnings Per Share) (Details)

v2.4.0.6
Summary of Significant Accounting Policies (Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator [Abstract]                      
Net loss $ (15,539) $ (2,309) $ (5,519) $ (7,490) $ (5,297) $ (2,742) $ (5,040) $ (3,471) $ (30,857) $ (16,550) $ (8,541)
Denominator [Abstract]                      
Weighted-average shares of common stock outstanding (shares)                 36,768 35,674 24,597
Weighted-average shares of common stock subject to repurchase (shares)                 0 0 (3)
Weighted-average shares of common stock used in computing net loss per share of common stock, basic and diluted (shares)                 36,768 35,674 24,594
Net loss per share of common stock, basic and diluted (dollars per share) $ (0.41) $ (0.06) $ (0.15) $ (0.21) $ (0.15) $ (0.08) $ (0.14) $ (0.10) $ (0.84) $ (0.46) $ (0.35)