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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Operating activities:        
Net income $ 1,734,000 $ 1,191,000   $ 1,191,000
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation       427,000
Depreciation, Depletion and Amortization 967,000      
Share-based compensation     3,420,000 2,032,000
Excess tax benefits on share-based compensation     0 (1,395,000)
Tax Benefit from Stock Options Exercised     (10,000) 1,358,000
Provision for doubtful accounts     (60,000) (220,000)
Changes in operating assets and liabilities:        
Accounts and unbilled receivables     (3,877,000) 6,219,000
Prepaid expenses and other assets     (1,162,000) (318,000)
Accounts payable     1,070,000 (183,000)
Accrued liabilities     980,000 (226,000)
Accrued payroll and other employee benefits     (4,549,000) (3,059,000)
Deferred revenue     2,748,000 (2,402,000)
Net cash provided by operating activities 1,261,000 3,424,000    
Investing activities:        
Purchases of property and equipment     (948,000) (684,000)
Internal-use software development costs capitalized (796,000) (347,000)    
Net cash used in investing activities (1,744,000) (1,031,000)    
Financing activities:        
Exercise of stock options     1,409,000 488,000
Excess tax benefits on share-based compensation     0 1,395,000
Tax withholding related to net share settlement of restricted stock units     (2,022,000) (1,820,000)
Debt Issuance Cost 200,000      
Net cash (used in) provided by financing activities (613,000) 63,000    
Net increase in cash and cash equivalents (1,096,000) 2,456,000    
Cash and cash equivalents:        
Beginning of period 83,558,000 70,913,000 70,913,000  
End of period $ 82,462,000 $ 68,457,000 $ 83,558,000 $ 70,913,000