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Subsequent Events (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 15, 2019
$ / shares
Feb. 13, 2019
USD ($)
Jan. 07, 2019
USD ($)
Installment
shares
Jan. 04, 2019
USD ($)
Jan. 02, 2019
USD ($)
Jan. 02, 2018
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Subsequent Event [Line Items]                  
Derivative Liability             $ 24,976 $ 37,096 $ 8,510
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period             3 years 6 months 3 years 6 months 3 years 6 months
PML JV                  
Subsequent Event [Line Items]                  
Percentage of Equity Interest in Joint Venture by Other Party, Irrevocable option to reacquire           10.00%      
Subsequent Event                  
Subsequent Event [Line Items]                  
Common Stock, Dividends, Per Share, Cash Paid | $ / shares $ 0.075                
Stock Granted, Value, Share-based Compensation, Forfeited     $ 600            
Stock options, Granted | shares     13,541            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     1 year            
Award vesting rate, initial year (percent)     33.33%            
Quarterly award vesting installments after initial year | Installment     8            
Subsequent Event | Essel [Member]                  
Subsequent Event [Line Items]                  
Business acquisition, cost of acquired entity, cash paid       $ 8,000          
Derivative Liability       $ 700          
Subsequent Event | Zillious [Member]                  
Subsequent Event [Line Items]                  
Business acquisition, cost of acquired entity, cash paid   $ 7,000              
Derivative Liability   $ 2,000              
Equity Method Investment, Ownership Percentage   80.00%              
Subsequent Event | PML JV                  
Subsequent Event [Line Items]                  
Percentage of Equity Interest in Joint Venture by Other Party, Irrevocable option to reacquire         10.00%        
Proceeds from Noncontrolling Interests         $ 5,000