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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities:    
Net income $ 6,255,000 $ 4,731,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 458,000 258,000
Stock-based compensation expense 1,660,000 1,309,000
Amortization of acquired intangible assets 18,000 18,000
Deferred taxes 1,886,000 981,000
Losses on disposal of property and equipment 34,000 46,000
Purchases of treasury stock in connection with tax withholdings on restricted stock grants (8,000) (8,000)
Reversal of doubtful accounts (28,000)  
Unrealized loss on foreign currency forward contract 24,000  
Tax benefit related to stock-based compensation expense 44,000 888,000
Excess tax benefit from stock-based compensation (41,000) (747,000)
Changes in operating assets and liabilities:    
Accounts receivable 2,373,000 1,844,000
Prepaid expenses and other assets (264,000) (2,528,000)
Accounts payable (279,000) (1,064,000)
Accrued compensation and related benefits (2,386,000) (4,832,000)
Accrued and other liabilities (442,000) (1,055,000)
Deferred revenues 2,537,000 668,000
Billings in excess of recognized revenues 248,000 (159,000)
Net cash provided by operating activities 12,089,000 350,000
Investing activities:    
Purchases of property and equipment (929,000) (1,211,000)
Net cash used in investing activities (929,000) (1,211,000)
Financing activities:    
Proceeds from exercise of stock options 784,000 1,201,000
Proceeds from employee stock purchase plan 632,000 546,000
Excess tax benefit from stock-based compensation 41,000 747,000
Purchases of treasury stock (968,000)  
Net cash provided by financing activities 489,000 2,494,000
Effect of exchange rate changes on cash and cash equivalents (26,000) (87,000)
Net change in cash and cash equivalents 11,623,000 1,546,000
Cash and cash equivalents, beginning of period 89,371,000 61,637,000
Cash and cash equivalents, end of period 100,994,000 63,183,000
Cash paid during the period for:    
Taxes 1,648,000 779,000
Property and equipment received and accrued in accounts payable and accrued and other liabilities $ 400,000 $ 559,000