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Summary of significant accounting policies (Tables) | 6 Months Ended
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Jun. 30, 2021
Accounting Policies [Abstract] |
Reconciliation of cash | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | End of |  | ​ | Beginning of
​ |  | period- |  | period-
​ |  | June 30, |  | December 31,
​ |  | 2021 | ​ | 2020
Cash and cash equivalents | ​ | $ | 177,347 | ​ | $ | 208,812
Restricted cash included in deposits and other assets | ​ |  | 7,500 | ​ |  | 7,500
Total Cash, cash equivalents and restricted cash per statement of cash flows | ​ | $ | 184,847 | ​ | $ | 216,312
Schedule of Inventory | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, 2021 |  | December 31, 2020
Raw materials | ​ | $ | 687 | ​ | $ | 824
Work in progress | ​ |  | 8,840 | ​ |  | 8,745
Finished goods | ​ |  | 6,914 | ​ |  | 9,128
Total inventory | ​ | $ | 16,441 | ​ | $ | 18,697

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(c)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6361739&loc=d3e7789-107766 + Details
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