Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information - (Detail)

v3.19.1
Subsequent Events - Additional Information - (Detail) - Subsequent Event [Member]
$ in Millions
Mar. 04, 2019
shares
Feb. 06, 2019
USD ($)
Subscriber
shares
Feb. 28, 2019
Subsequent Event [Line Items]      
Preferred shares purchase rights, declared date as dividend Mar. 04, 2019    
Preferred shares purchase rights for each common stock | shares 1    
Preferred shares purchase rights, record date as dividend Mar. 15, 2019    
TAR Holdings [Member] | Seachange International, Inc [Member]      
Subsequent Event [Line Items]      
Ownership percentage     20.60%
Xstream A/S [Member]      
Subsequent Event [Line Items]      
Payments to acquire business | $   $ 4.6  
Business combination, shares of common stock | shares   541,738  
Business combination, total transaction value | $   $ 5.5  
Minimum [Member] | Xstream A/S [Member]      
Subsequent Event [Line Items]      
Number of OTT video subscribers | Subscriber   5,000,000