XML 86 R71.htm IDEA: XBRL DOCUMENT v3.8.0.1
COMMITMENTS AND CONTINGENCIES - Future Minimum Lease Payments Under All Non-Cancelable Operating Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases      
2018 $ 1,575    
2019 1,497    
2020 1,013    
2021 591    
Total 4,676    
Rent expense      
Rent expense 1,900 $ 1,400 $ 1,600
India Department of Telecommunication Security and Supply Chain Standards      
Revenues from security agreements 98,292 86,512 117,103
Cost of goods sold 65,146 58,156 89,235
Equipment revenue 77,283 61,735 87,361
Cost of goods sold 50,636 41,472 65,891
Equipment based service revenue 21,009 24,777 29,742
Cost of services 14,510 $ 16,684 23,344
Security agreements with customers, as required by India's Department of Telecommunications ("DOT")      
India Department of Telecommunication Security and Supply Chain Standards      
Revenues from security agreements     $ 11,800
Revenue recognition, assessment period     5 years
Cost of goods sold     $ 5,400
Equipment revenue $ 0   5,600
Cost of goods sold     5,400
Equipment based service revenue     6,200
Cost of services     $ 10