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CONTRACT ASSETS AND LIABILITIES (Tables) | 12 Months Ended
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Jun. 30, 2020
CONTRACT ASSETS AND LIABILITIES |
Schedule of contract assets and contract liabilities | Contract Assets (in thousands) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | June 30, |  | ​ | ​ |  | ​ |
​ | ​ | 2019 | ​ | 2020 | ​ | Change | ​ | % Change | ​
Unbilled revenue (included in accounts receivable, net) | ​ | $ | 19,287 | ​ | $ | 43,011 | ​ | $ | 23,724 |  | 123 | %
​ Contract Liabilities (in thousands) ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2019 |  | June 30, 2020 |  | Change |  | % Change |
Advances from customers | ​ | $ | 43,227 | ​ | $ | 28,155 | ​ | $ | (15,072) |  | (35) | %
Deferred revenue—current | ​ |  | 33,641 | ​ |  | 32,863 | ​ |  | (778) |  | (2) | %
Deferred revenue—long-term | ​ |  | 9,506 | ​ |  | 13,214 | ​ |  | 3,708 |  | 39 | %
​

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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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