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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating activities:    
Net income $ 2,314,000 $ 2,186,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, Depletion and Amortization 1,999,000 938,000
Share-based compensation 7,559,000 4,472,000
Excess tax benefits on share-based compensation 0 (1,685,000)
Tax Benefit from Stock Options Exercised (10,000) 1,633,000
Provision for doubtful accounts (70,000) (257,000)
Changes in operating assets and liabilities:    
Accounts and unbilled receivables 1,317,000 (2,407,000)
Prepaid expenses and other assets (821,000) 4,177,000
Accounts payable 715,000 (2,465,000)
Accrued liabilities 391,000 630,000
Accrued payroll and other employee benefits (2,841,000) (1,115,000)
Deferred revenue (2,619,000) 846,000
Net cash provided by operating activities 7,934,000 6,953,000
Investing activities:    
Purchases of property and equipment (2,172,000) (3,264,000)
Internal-use software development costs capitalized 1,534,000 815,000
Net cash used in investing activities (3,706,000) (4,079,000)
Financing activities:    
Exercise of stock options 2,771,000 511,000
Excess tax benefits on share-based compensation 0 1,685,000
Tax withholding related to net share settlement of restricted stock units (2,330,000) (2,365,000)
Net cash (used in) provided by financing activities 441,000 (169,000)
Net increase in cash and cash equivalents 4,669,000 2,705,000
Cash and cash equivalents:    
Beginning of period 83,558,000 68,457,000
End of period $ 88,227,000 $ 71,162,000