Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Other Commitments (Details)

v3.19.1
Commitments and Contingencies - Other Commitments (Details) - USD ($)
$ in Thousands
Jul. 27, 2017
Dec. 31, 2018
Dec. 31, 2017
Jul. 27, 2016
Other Commitments [Line Items]        
Earn-out liability   $ 114 $ 114  
Emerging Markets Communications LLC        
Other Commitments [Line Items]        
Additional consideration payable       $ 25,000
Shares issued 5,080,049      
Line of Credit | Letters of Credit        
Other Commitments [Line Items]        
Letters of credit outstanding   6,100    
Line of Credit | 2017 Credit Agreement        
Other Commitments [Line Items]        
Letters of credit outstanding   $ 5,600