Quarterly report pursuant to Section 13 or 15(d)

Business Combinations - Schedule of Consideration Transferred (Details)

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Business Combinations - Schedule of Consideration Transferred (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Jul. 27, 2016
Sep. 30, 2016
Sep. 30, 2015
Business Acquisition [Line Items]      
Cash consideration paid   $ 4,400 $ 0
Emerging Markets Communications LLC      
Business Acquisition [Line Items]      
Cash consideration paid $ 100,658    
5,466,886 Company common shares multiplied by the $8.03 closing share price per share of on July 27, 2016, less a 7.5% discount for restrictions on transferability, value 40,607    
Deferred consideration 25,000    
Settlement of pre-existing relationship 228    
Consideration transferred $ 166,493    
Share price of common stock (in usd per share) $ 8.40    
Emerging Markets Communications LLC | Cash Payment, Minimum      
Business Acquisition [Line Items]      
Cash consideration paid $ 30,000    
Emerging Markets Communications LLC | Restructuring Bonus Plan Payout      
Business Acquisition [Line Items]      
Cash consideration paid 4,500    
Emerging Markets Communications LLC | Payment Related to Prior Acquisition      
Business Acquisition [Line Items]      
Cash consideration paid 1,000    
Emerging Markets Communications LLC | Seller's Transaction Expenses Paid      
Business Acquisition [Line Items]      
Cash consideration paid 5,800    
Emerging Markets Communications LLC | Indemnity Escrow Amount      
Business Acquisition [Line Items]      
Cash consideration paid 2,700    
Emerging Markets Communications LLC | Adjustment Escrow      
Business Acquisition [Line Items]      
Cash consideration paid $ 1,500    
Common Stock | Emerging Markets Communications LLC      
Business Acquisition [Line Items]      
Common stock issued for acquisition (in shares) 5,466,886    
Share price of common stock (in usd per share) $ 8.03    
Restrictions on transferability of common stock, discount rate 7.50%    
Preferred Stock | Emerging Markets Communications LLC      
Business Acquisition [Line Items]      
Preferred stock redeemed (in shares) $ 55,100