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Consolidated Statements Of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating activities      
Net (loss) income $ (15,790) $ (1,576) $ 3,969
Adjustments to reconcile net (loss) income to net cash provided by operating activities:      
Depreciation 13,352 8,422 6,544
Amortization of intangible assets resulting from acquisitions 9,301 4,534 1,457
Provision for bad debts 220 167 290
Stock-based compensation 21,260 17,773 9,849
Amortization of deferred rent (822) (906) (632)
Amortization of bond premium   188 610
Deferred tax (benefit) provision (4,356) (1,938) 5,096
Loss on asset disposal 25 13 139
Gain on sale of marketable securities (211)   (89)
Settlement of litigation 5,175    
Changes in operating assets and liabilities:      
Accounts receivable (10,184) (15,101) (4,491)
Prepaid expenses and other current assets (1,520) (4,492) 28
Accounts payable, accrued expenses, and other liabilities 11,390 2,854 (2,908)
Deferred revenues (1,610) 15,064 4,838
Deferred rent 520 408 331
Net cash provided by operating activities 26,750 25,410 25,031
Investing activities      
Acquisitions, net of cash acquired (5,162) (68,880) (1,296)
Purchase of investments     (50,197)
Sales and maturities of investments 2,591 29,976 57,973
Purchase of property and equipment (7,235) (5,119) (6,472)
Net cash (used in) provided by investing activities (9,806) (44,023) 8
Financing activities      
Proceeds from the exercise of common stock options 371 988 922
Repurchase of common stock (7,392) (5,472) (1,573)
Excess tax benefits from stock based compensation 177 128  
Principal payments on capital lease obligations (5,390) (1,727) (1,064)
Debt issuance costs (69)    
Net cash used in financing activities (12,303) (6,083) (1,715)
Effect of exchange rate changes on cash (306) 148 663
Net increase (decrease) in cash and cash equivalents 4,335 (24,548) 23,987
Cash and cash equivalents at beginning of year 33,736 58,284 34,297
Cash and cash equivalents at end of year 38,071 33,736 58,284
Supplemental cash flow disclosures      
Interest paid 701 296 63
Net income tax paid 2,027 1,340 1,615
Supplemental noncash investing and financing activities      
Capital lease obligations incurred 5,411 12,309 1,121
Leasehold improvements acquired through lease incentives 331 424 333
Patents acquired through issuance of common stock $ 11,000    
Stock issued in connection with business combination 15,000