AQUISITIONS (Details ) - USD ($)
$ in Thousands
May 04, 2016
Feb. 02, 2015
Jun. 18, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Tangible assets acquired and assumed:            
Goodwill       $ 48,903 $ 34,528 $ 27,557
United Online Inc [Member]            
Total consideration $ 169,354          
Tangible assets acquired and assumed:            
Cash and cash equivalents 125,542          
Restricted cash 482          
Accounts receivables 3,850          
Inventory 624          
Property and equipment 5,536          
Prepaid expenses and other assets 5,876          
Accounts payable (4,874)          
Accrued expenses and other liabilities (8,886)          
Deferred revenue (2,900)          
Deferred tax liabilities (6,824)          
Other liabilities (3,180)          
Customer relationships 33,700          
Advertising relationships 100          
Trade name and trademarks 1,100          
Domain names 1,500          
Internally developed software 3,333          
Goodwill 14,375          
Total consideration $ 169,354          
MK Capital Advisors, LLC [Member] | Purchase Agreement [Member]            
Total consideration   $ 9,386        
Tangible assets acquired and assumed:            
Cash and cash equivalents   49        
Accounts receivables   8        
Property and equipment   15        
Prepaid expenses and other assets   30        
Accounts payable and accrued liabilities   (87)        
Customer relationships   2,400        
Goodwill   6,971        
Total consideration   $ 9,386        
B. Riley and Co. Inc [Member] | Acquisition Agreement [Member]            
Total consideration     $ 26,351      
Tangible assets acquired and assumed:            
Cash and cash equivalents     2,667      
Restricted cash     50      
Securities owned     1,978      
Accounts receivables     1,845      
Property and equipment     76      
Prepaid expenses and other assets     302      
Accounts payable and accrued liabilities     (3,194)      
Securities sold, not yet purchased     (922)      
Deferred tax liabilities     (1,120)      
Customer relationships     1,200      
Trade name and trademarks     1,600      
Goodwill     21,869      
Total consideration     $ 26,351