Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 27, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Jan. 06, 2017
Dec. 31, 2016
Jul. 27, 2016
Feb. 28, 2015
Accounting Policies [Line Items]                          
Discount   $ 67,105,000   $ 41,136,000     $ 67,105,000   $ 41,136,000        
Adoption of ASC 606 - Cumulative Adjustment       933,000         933,000        
Revenue   164,027,000     $ 151,537,000   486,487,000 $ 459,871,000          
Repayment of revolving credit facility             (80,585,000) 0          
Stated interest rate                         2.75%
Decrease in cost of goods sold   (128,569,000)     (112,951,000)   (373,382,000) (341,580,000)          
Cash and cash equivalents   31,731,000   48,260,000     31,731,000   48,260,000        
Phantom stock options liability   10,200,000         10,200,000            
Aggregate estimated fair value of phantom stock options   1,240,000         1,240,000            
Restricted Cash                          
Restricted cash   801,000   3,608,000     801,000   3,608,000        
Intangible Assets and Goodwill:                          
Impairment of goodwill   0     0   0 78,000,000 167,000,000        
Goodwill   159,610,000   159,696,000     159,610,000   159,696,000        
Income Taxes                          
Income tax benefit due to the Tax Act                 4,600,000        
Impact due to repatriation charge                 0        
Repatriation charge                 17,200,000        
Adoption of New Accounting Standards                          
Increase in cash equivalents and restricted cash balances [1]   32,532,000   51,868,000 59,058,000   32,532,000 59,058,000 51,868,000   $ 68,678,000    
Decrease in cash used by operating activities             69,465,000 71,412,000          
Decrease in cash used in investing activities             33,523,000 61,417,000          
Media & Content Reporting Unit                          
Accounting Policies [Line Items]                          
Revenue   80,649,000     71,348,000   239,020,000 222,294,000          
Intangible Assets and Goodwill:                          
Goodwill   83,458,000   83,529,000     83,458,000   83,529,000        
Maritime & Land Connectivity Reporting Unit                          
Intangible Assets and Goodwill:                          
Impairment of goodwill       45,000,000   $ 78,000,000              
Goodwill   22,130,000   22,130,000     22,130,000   22,130,000        
Wireless Maritime Services                          
Accounting Policies [Line Items]                          
Maximum borrowing capacity   6,400,000         6,400,000            
Investments in Equity Affiliates                          
Equity method investment, ownership percentage                       49.00%  
Santander                          
Investments in Equity Affiliates                          
Equity method investment, ownership percentage                       49.00%  
Accumulated Deficit                          
Accounting Policies [Line Items]                          
Adoption of ASC 606 - Cumulative Adjustment       933,000         933,000        
MTN                          
Restricted Cash                          
Restricted cash                     16,000,000    
Public SPAC Warrants                          
Derivative Warrants                          
Change in value         100,000   100,000 (300,000)          
ASU 2014-09 | Accumulated Deficit                          
Accounting Policies [Line Items]                          
Adoption of ASC 606 - Cumulative Adjustment       $ 900,000         $ 900,000        
Adoption of New Accounting Standards                          
Increase in cash equivalents and restricted cash balances         $ 1,000,000     1,000,000     $ 18,000,000    
Decrease in cash used by operating activities               16,400,000          
Decrease in cash used in investing activities               $ 600,000          
ASU 2014-09 | Accumulated Deficit | Media & Content Reporting Unit                          
Accounting Policies [Line Items]                          
Decrease in cost of goods sold   500,000         1,300,000            
Revolving Credit Facility                          
Accounting Policies [Line Items]                          
Repayments of debt     $ 78,000,000                    
Line of Credit                          
Accounting Policies [Line Items]                          
Maximum borrowing capacity                   $ 585,000,000      
Letters of credit outstanding   6,500,000         6,500,000            
Line of Credit | Revolving Credit Facility                          
Accounting Policies [Line Items]                          
Repayments of debt     $ 78,000,000                    
Maximum borrowing capacity                   85,000,000      
Line of Credit | Letters of Credit                          
Accounting Policies [Line Items]                          
Maximum borrowing capacity                   $ 15,000,000      
Letters of credit outstanding   5,800,000         5,800,000            
Effect of change Increase/ (Decrease) | ASU 2014-09                          
Accounting Policies [Line Items]                          
Revenue   542,000         191,000            
Decrease in cost of goods sold   $ 462,000         $ 1,274,000            
Second Lien Credit Agreement                          
Accounting Policies [Line Items]                          
Proceeds from issuance of debt $ 143,000,000                        
[1] September 30, 2017 figures have been recast to include the impact of the adoption of ASU 2016-18. See Note 2. Basis of Presentation and Summary of Significant Accounting Policies