Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.3.0.814
Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 9 Months Ended
May. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Operating Leased Assets [Line Items]        
Litigation settlement expense     $ 4,700,000  
Office Space        
Operating Leased Assets [Line Items]        
Cease-use liability   $ (200,000)    
Richardson, Texas | Office Space        
Operating Leased Assets [Line Items]        
Term of lease 12 years      
Lawsuit Related to Screening Services        
Operating Leased Assets [Line Items]        
Estimated settlement costs       $ 0
General and Administrative | San Francisco, California | Office Space        
Operating Leased Assets [Line Items]        
Downward adjustment to deferred rent liability   900,000    
Purchase of Computer Software        
Operating Leased Assets [Line Items]        
Remaining amount under the commitment   $ 2,000,000