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COMMITMENTS AND CONTINGENCIES - Future Minimum Lease Payments Under All Non-Cancelable Operating Leases (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Leases |  |  |
2017 | $ 1,416 |  |
2018 | 1,082 |  |
2019 | 1,038 |  |
2020 | 921 |  |
2021 | 537 |  |
Future minimum lease payments | 4,994 |  |
Rent expense |  |  |
Rent expense | 1,400 | $ 1,600 | $ 1,800
India Department of Telecommunication Security and Supply Chain Standards |  |  |
Revenues from security agreements | 86,512 | 117,103 | 129,420
Cost of goods sold | 58,156 | 89,235 | 107,292
Equipment revenue | 61,735 | 87,361 | 105,988
Cost of Goods Sold | 41,472 | 65,891 | 84,988
Equipment based service revenue | 24,777 | 29,742 | 23,432
Cost of Services | $ 16,684 | 23,344 | 22,304
Security agreement 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 |
Deferred revenue related to contracts covered by security agreements |  | 0 | 11,700
Deferred costs related to contracts covered by security agreements |  | $ 0 | $ 5,700
Revenue Recognition, assessment period |  | 5 years |
Cost of goods sold |  | $ 5,400 |
Equipment revenue |  | 5,600 |
Cost of Goods Sold |  | 5,400 |
Equipment based service revenue |  | 6,200 |
Cost of Services |  | $ 10 |

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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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