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Summary of Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2019
Summary of Significant Accounting Policies |
Schedule of balances of contract receivables and liabilities | ​
​ ​ ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Contract Balances | ​ | ​ | ​
​ | ​ | Net Receivables | ​ | Contract Liabilities, Current | ​ | Contract Liabilities, Long-Term
Opening, January 1, 2018 | ​ | $ | 11,065 | ​ | ​ | 31 | ​ | ​ | 68
Closing, June 30, 2018 | ​ | ​ | 12,359 | ​ | ​ | 27 | ​ | ​ | 55
Increase (decrease) | ​ | ​ | 1,294 | ​ | ​ | (4) | ​ | ​ | (13)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Opening, January 1, 2019 | ​ | $ | 15,321 | ​ | ​ | 18 | ​ | ​ | 42
Closing, June 30, 2019 | ​ | ​ | 16,285 | ​ | ​ | 19 | ​ | ​ | 29
Increase (decrease) | ​ | ​ | 964 | ​ | ​ | 1 | ​ | ​ | (13)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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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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