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Debt - Convertible Senior Notes (Details) - Convertible Debt - USD ($)
$ / shares in Units, $ in Millions
Aug. 23, 2017
Jan. 09, 2017
Mar. 31, 2018
Jun. 10, 2015
Debt Instrument [Line Items]        
Effective interest rate     16.19%  
Novatel Wireless Notes        
Debt Instrument [Line Items]        
Principal   $ 0.2   $ 120.0
Stated interest rate of debt issued       5.50%
Converted amount   119.8    
Conversion price ($ per share)       $ 5.00
Debt issuance costs       $ 3.9
Inseego Notes        
Debt Instrument [Line Items]        
Principal   $ 119.8    
Extinguishment of debt, amount $ 14.9      
Stated interest rate of debt issued   5.50%    
Conversion (shares)   212.7660    
Conversion price ($ per share)   $ 4.70    
Redemption price as a percentage of principal amount   100.00%    
Redemption of principal   100.00%    
Increase in fair value of equity component   $ 3.6    
Proceeds from issuance of debt, portion funded in repurchase and cancellation of debt $ 11.9      
Inseego Notes | Debt Instrument, Redemption, Period Three [Member]        
Debt Instrument [Line Items]        
Redemption price as a percentage of principal amount   100.00%