Consolidated Statement of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Revenues        
License $ 41,951 $ 22,112 $ 101,895 $ 59,807
Maintenance and services 19,128 10,014 49,086 26,120
Total revenues 61,079 32,126 150,981 85,927
Cost of revenues        
License 237 21 523 170
Maintenance and services 4,341 2,788 11,951 6,809
Total cost of revenues 4,578 [1] 2,809 [1] 12,474 [1] 6,979 [1]
Gross profit 56,501 29,317 138,507 78,948
Operating expenses (1)        
Sales and marketing 32,189 [1] 15,565 [1] 83,426 [1] 39,125 [1]
Research and development 15,438 [1] 8,488 [1] 42,514 [1] 22,706 [1]
General and administrative 6,345 [1] 4,278 [1] 18,064 [1] 10,533 [1]
Total operating expenses 53,972 28,331 144,004 72,364
Operating income (loss) 2,529 986 (5,497) 6,584
Other income (expense), net (177) (22) (350) (49)
Income (loss) before income tax expense (benefit) 2,352 964 (5,847) 6,535
Income tax expense (benefit) (89) 597 (1,678) 4,052
Net income (loss) 2,441 367 (4,169) 2,483
Net income (loss) per share attributable to common stockholders        
Basic (in usd per share) $ 0.04 $ 0.00 $ (0.09) $ 0.03
Diluted (in usd per share) $ 0.03 $ 0.00 $ (0.09) $ 0.03
Weighted average shares used to compute net income (loss) per share attributable to common stockholders        
Basic (in shares) 59,143 33,851 47,093 33,676
Diluted (in shares) 71,348 39,960 47,093 39,597
Share-based Compensation [Abstract]        
Total stock-based compensation expense 3,730 1,197 9,533 3,253
Cost of Revenues [Member]
        
Share-based Compensation [Abstract]        
Total stock-based compensation expense 113 28 291 66
Sales and Marketing [Member]
        
Share-based Compensation [Abstract]        
Total stock-based compensation expense 1,442 350 3,506 933
Research and Development [Member]
        
Share-based Compensation [Abstract]        
Total stock-based compensation expense 1,473 531 3,785 1,445
General and Administrative [Member]
        
Share-based Compensation [Abstract]        
Total stock-based compensation expense $ 702 $ 288 $ 1,951 $ 809
[1] Includes stock-based compensation expense as follows: Three Months Ended September 30, Nine Months Ended September 30, 2013 2012 2013 2012 (in thousands)Cost of revenues$113 $28 $291 $66Sales and marketing1,442 350 3,506 933Research and development1,473 531 3,785 1,445General and administrative702 288 1,951 809Total stock-based compensation expense$3,730 $1,197 $9,533 $3,253