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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 20, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Commitments And Contingencies [Line Items]          
Operating leases expenses   $ 1,030 $ 1,033 $ 2,150 $ 2,018
Standby letter of credit   1,384   1,384  
Pre-tax gain   6,909   $ 6,909  
Tradeworx Inc [Member]          
Commitments And Contingencies [Line Items]          
Equity exchange agreement description Pursuant to the equity exchange agreement, the Company was issued shares of newly authorized preferred stock reflecting ownership of 19.99% of Tradeworx on a fully diluted basis (excluding certain reserved shares). The shares of preferred stock rank pari passu in priority with Tradeworx’s current preferred stockholders. In addition, Tradeworx issued the Company a warrant to purchase up to an additional 50% of the number of shares of preferred stock issued to the Company at closing, exercisable for five years after the closing, at varying exercise prices that increase over time and set at multiples of a pre-determined Tradeworx valuation (or a new valuation if Tradeworx completes a qualified financing, as defined, within two years). If a claim is brought against Tradeworx or the Company relating to the settlement, the warrant will be exercisable for 100% of the number of shares of preferred stock issued to the Company at closing. Pursuant to the stockholders agreement, the Company has the right to appoint one of five directors to Tradeworx’s board of directors, as well as additional customary rights, including (i) consent rights on certain transactions (e.g., related-party transactions and certain changes to organizational documents); (ii) pre-emptive rights on future issuances of shares, subject to customary carve-outs; (iii) information rights; and (iv) registration rights.        
Tradeworx Inc [Member] | Convertible Preferred Stock [Member]          
Commitments And Contingencies [Line Items]          
Pre-tax gain   $ 6,909      
Tradeworx Inc [Member] | Convertible Preferred Stock [Member] | Series Y Preferred Stock [Member]          
Commitments And Contingencies [Line Items]          
Fully diluted ownership interest percentage 19.99%        
Tradeworx Inc [Member] | Warrant [Member]          
Commitments And Contingencies [Line Items]          
Warrant to purchase maximum additional percentage of shares 50.00%        
Warrant exercisable term 5 years        
Exercisable percentage of warrant if claim brought against Company 100.00%