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Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenues:    
ETF advisory fees $ 29,153 $ 18,975
Other income 188 195
Total revenues 29,341 19,170
Expenses:    
Compensation and benefits 7,482 5,857
Fund management and administration 8,223 5,439
Marketing and advertising 1,937 1,326
Sales and business development 1,801 860
Professional and consulting fees 613 1,109
Occupancy, communications, and equipment 377 301
Depreciation and amortization 82 71
Third-party sharing arrangements 111 1,745
Other 861 609
ETF shareholder proxy   66
Patent litigation, net   672
Total expenses 21,487 18,055
Income before provision for income taxes 7,854 1,115
Provision for income taxes      
Net income $ 7,854 $ 1,115
Net income per share-basic $ 0.06 $ 0.01
Net income per share-diluted $ 0.06 $ 0.01
Weighted-average common shares-basic 125,436 119,182
Weighted-average common shares-diluted 139,650 137,400