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Summary of significant accounting policies (Tables) | 9 Months Ended
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Sep. 30, 2020
Accounting Policies [Abstract] |
Reconciliation of cash | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheet that sum to the total of the same amounts shown in the statement of cash flows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Beginning of |  | ​ | ​
​ |  | period- |  | End of period-
​ |  | December 31, |  | September 30,
​ |  | 2019 | ​ | 2020
Cash and cash equivalents | ​ | $ | 288,028 | ​ | $ | 433,970
Restricted cash included in deposits and other assets | ​ |  | 7,500 | ​ |  | 7,500
Total Cash, cash equivalents and restricted cash per statement of cash flows | ​ | $ | 295,528 | ​ | $ | 441,470
Schedule of Inventory | The following table summarizes the components of the Company’s inventory for the periods indicated:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2020 |  | December 31, 2019
Raw materials | ​ | $ | 946 | ​ | $ | 874
Work in progress | ​ |  | 8,600 | ​ |  | 9,652
Finished goods | ​ |  | 9,935 | ​ |  | 8,759
Total inventory | ​ | $ | 19,481 | ​ | $ | 19,285

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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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