Long-term Debt - Cosine Long-Term Debt Facilities (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2016
GBP (£)
Revolving Credit Facility | HSBC Bank plc | CoSine Communications, Inc. and API Group plc    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 17,500 £ 13,500,000
Remaining borrowing capacity $ 5,839  
Interest rate (as a percent) 1.80% 1.80%
Revolving Credit Facility | HSBC | CoSine Communications, Inc. and API Group plc    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 4,500  
Remaining borrowing capacity $ 2,010  
Interest rate (as a percent) 3.50% 3.50%
Collateral pledged $ 12,300  
Term Loan | API Group plc (API)    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 9,000  
Interest rate (as a percent) 3.50% 3.50%
Mortage Loan, Second Facility | Mortgages | Handy & Harman Ltd. (HNH)    
Debt Instrument [Line Items]    
Collateral pledged $ 40,000  
Equipment loan one | Term Loan | API Group plc (API)    
Debt Instrument [Line Items]    
Maximum borrowing capacity 1,305  
Equipment loan two | Term Loan | API Group plc (API)    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 1,009  
Interest rate (as a percent) 4.30% 4.30%
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | HSBC | CoSine Communications, Inc. and API Group plc    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 3.00%  
London Interbank Offered Rate (LIBOR) | Term Loan | API Group plc (API)    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 3.00%  
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 2.50%  
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | HSBC Bank plc | CoSine Communications, Inc. and API Group plc    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 1.50%  
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 3.25%  
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | HSBC Bank plc | CoSine Communications, Inc. and API Group plc    
Debt Instrument [Line Items]    
Basis spread on variable rate (as a percent) 2.40%