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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Summary of Significant Accounting Policies |
Reconciliation of cash, cash equivalents and restricted cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2019 | ​ | 2018
Cash and cash equivalents | ​ | $ | 35,724 | ​ | $ | 24,294
Restricted cash | ​ | ​ | 6,000 | ​ | ​ | 6,000
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows | ​ | $ | 41,724 | ​ | $ | 30,294
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 | ​ | ​ | 32 | ​ | ​ | 69
Closing, December 31, 2018 | ​ | ​ | 15,321 | ​ | ​ | 18 | ​ | ​ | 42
Increase (decrease) | ​ | ​ | 4,256 | ​ | ​ | (14) | ​ | ​ | (27)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Opening, January 1, 2019 | ​ | $ | 15,321 | ​ | ​ | 18 | ​ | ​ | 42
Closing, December 31, 2019 | ​ | ​ | 16,944 | ​ | ​ | 14 | ​ | ​ | 15
Increase (decrease) | ​ | ​ | 1,623 | ​ | ​ | (4) | ​ | ​ | (27)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​

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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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