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Contract Assets and Liabilities (Tables) | 6 Months Ended
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Dec. 31, 2020
Contract Assets and Liabilities |
Schedule of contract assets and contract liabilities | ​ Contract assets and liabilities were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | December 31, |  | ​ | ​ |  | ​ |
Contract Assets: | ​ | 2020 | ​ | 2020 | ​ | $ Change | ​ | % Change |
Unbilled revenue | ​ | $ | 43,011 | ​ | $ | 46,481 | ​ | $ | 3,470 |  | 8 | %
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Contract Liabilities: |  | ​ |  | ​ |  | ​ |  | ​ |
Advances from customers | ​ | $ | 28,155 | ​ | $ | 73,899 | ​ | $ | 45,744 | ​ | 162 | %
Deferred revenue—current | ​ |  | 32,863 | ​ |  | 33,160 | ​ |  | 297 | ​ | 1 | %
Deferred revenue—long-term | ​ |  | 13,214 | ​ |  | 13,542 | ​ |  | 328 | ​ | 2 | %

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + 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=121604090&loc=SL49130551-203045 + Details
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