Annual report pursuant to Section 13 and 15(d)

Acquisitions and Recent Transactions - 2017 Acquisitions - Digital Media - Additional Information (Detail)

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Acquisitions and Recent Transactions - 2017 Acquisitions - Digital Media - Additional Information (Detail) - USD ($)
 12 Months Ended
Aug. 31, 2017
Jul. 06, 2017
Jun. 08, 2017
Mar. 15, 2017
Dec. 31, 2018
Dec. 31, 2017
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Business combination, consideration transferred         $ 11,180,000 $ 4,043,000
Teacher Tube.com Business Acquisition [Member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Business acquisition, Effective Date of Acquisition Aug. 31, 2017         Aug. 31, 2017
Business combination, consideration transferred $ 1,100,000         $ 1,100,000
Intelligence Reporter Newsletter Business Acquisition [Member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Business acquisition, Effective Date of Acquisition Aug. 31, 2017         Aug. 31, 2017
Business combination, consideration transferred $ 2,500,000          
Business combination, deferred subscription liabilities $ 2,900,000          
TradersCrux.com Business Acquisition [Member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Business acquisition, Effective Date of Acquisition   Jul. 06, 2017       Jul. 06, 2017
Business combination, consideration transferred   $ 300,000       $ 298,000
Estimated contingent earn-out consideration   $ 100,000        
Portuguese Bible Mobile Applications Business Acquisition [Member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Business acquisition, Effective Date of Acquisition     Jun. 08, 2017     Jun. 08, 2017
Business combination, consideration transferred     $ 65,000     $ 82,000
Estimated contingent earn-out consideration     $ 20,000      
Prayers for Special Help Business Acquisition [Member]            
Summary of Investments, Other than Investments in Related Parties, Reportable Data [Line Items]            
Business acquisition, Effective Date of Acquisition       Mar. 15, 2017   Mar. 15, 2017
Business combination, consideration transferred       $ 200,000   $ 245,000