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REVENUE (Tables) | 9 Months Ended
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Sep. 30, 2020
REVENUE |
Schedule of contract assets and contract liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, |  | December 31,
​ |  | 2020 |  | 2019
Contract assets | ​ | $ | 29,569 | ​ | $ | 28,529
Contract liabilities | ​ | $ | 4,546 | ​ | $ | 4,935
Schedule of revenue disaggregated by geographic area | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended | ​ | ​ | Nine Months Ended
​ | ​ | ​ | September 30, | ​ | ​ | September 30,
Geographic area |  | ​ | 2020 |  | 2019 |  | ​ | 2020 |  | 2019
Americas | ​ | $ | 34,968 | ​ | $ | 40,253 | ​ | ​ | 103,422 | ​ | $ | 118,738
Europe | ​ | ​ | 20,928 | ​ | ​ | 22,558 |  | ​ | 64,044 | ​ | ​ | 67,562
Asia Pacific | ​ | ​ | 5,739 | ​ | ​ | 5,332 | ​ | ​ | 15,273 | ​ | ​ | 13,962
​ | ​ | $ | 61,635 | ​ | $ | 68,143 | ​ | $ | 182,739 | ​ | $ | 200,262

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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