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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities:          
Net income (loss) $ (6,684) $ 4,803 $ (37,348) $ 9,830 $ (29,705)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:          
Depreciation and amortization 2,045 502 13,506 1,472 369
Amortization of premiums on short-term investments, net 0 0 (1,337) 0 0
Amortization of deferred commissions 3,492 1,642 13,710 4,023 2,189
Stock-based compensation 5,637 1,121 27,937 2,954 545
Tax benefit from exercise of stock options (41) (117) (1,694) (138) 0
Deferred tax assets 0 0 (746) 0 0
Expense for preferred stock warrants 0 0 0 0 702
Bad debt expense 0 0 384 0 64
(Gain) Loss on disposal of property and equipment 72 0 (1) 60 0
Lease abandonment costs 0 0 2,467 0 0
Changes in operating assets and liabilities:          
Accounts receivable (20,365) (7,631) (33,341) (14,762) (5,176)
Deferred commissions (8,313) (2,180) (29,175) (5,568) (5,271)
Prepaid expenses and other current assets (1,355) [1] (560) [1] (2,537) [1] (2,872) [1] (4,851) [1]
Other assets (90) (88) (367) (308) (91)
Accounts payable 1,490 (845) 4,887 254 912
Accrued expenses and other current liabilities 6,921 1,569 22,948 5,438 8,901
Deferred rent (151) (57) (2,227) 3,179 (85)
Deferred revenue 29,990 12,557 64,845 33,915 23,953
Other long-term liabilities 572 (5) 4,181 (9) 12
Net cash provided by (used in) operating activities 13,220 10,711 48,766 37,468 (7,532)
Cash flows from investing activities:          
Purchases of property and equipment (7,959) (2,057) (42,066) (8,733) (1,584)
Purchases of short-term investments 0 0 (240,626) 0 0
Sale of short-term investments 0 0 (1,025) 0 0
Maturities of short-term investments 0 0 42,473 0 0
Restricted cash 0 200 45 350 129
Net cash used in investing activities (7,959) (1,857) (239,149) (8,383) (1,455)
Cash flows from financing activities:          
Net proceeds from initial public offering 0 0 169,784 0 0
Net proceeds from issuance of common stock 0 0 50,561 0 0
Proceeds from exercise of stock options 1,284 105 2,963 446 241
Proceeds from early exercise of stock options 844 0 949 643 0
Tax benefit from exercise of stock options 41 117 1,694 138 0
Net proceeds from issuance of convertible preferred stock 0 0 0 0 51,245
Proceeds from Issuance of Private Placement 0 0 17,848 0 0
Purchases of common stock and restricted stock from stockholders (15) 0 (1,960) 0 (20,814)
Net cash provided by financing activities 2,154 222 241,839 1,227 30,672
Foreign currency effect on cash and cash equivalents 820 (21) (555) 139 (71)
Net increase in cash and cash equivalents 8,235 9,055 50,901 30,451 21,614
Cash at beginning of period 59,853 29,402 68,088 29,402 7,788
Cash and cash equivalents at end of period 68,088 38,457 118,989 59,853 29,402
Supplemental disclosures of other cash flow information:          
Interest paid 0 1 3 5 10
Taxes paid 360 0 1,524 1,403 4
Non-cash investing and financing activities:          
Conversion of preferred stock to common stock 0 0 68,480 0 0
Property and equipment included in accounts payable and accrued expenses 6,296 369 1,234 756 196
Property and equipment acquired under capital leases 0 0 0 0 25
Exercise of stock options included in prepaid and other assets 0 0 1,089 0 0
Vesting of early exercised stock options 208 0 1,606 36 0
Accretion of preferred stock dividends and issuance costs 312 320 308 633 640
Offering costs not yet paid $ 0 $ 0 $ 711 $ 0 $ 0
[1] Includes $5.3 million payment received from our founder during the year ended December 31, 2012. Refer to Note 16.