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Summary of significant accounting policies - (Tables) | 9 Months Ended
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Sep. 30, 2019
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- December 31, 2018 |  | End of period- September 30, 2019
Cash and cash equivalents |  | $ | 169,498 |  |  | $ | 523,577 |
Restricted cash included in deposits and other assets |  | — |  |  | 7,500 |
Total Cash, cash equivalents and restricted cash per statement of cash flows |  | $ | 169,498 |  |  | $ | 531,077 |
Schedule of Inventory | The following table summarizes the components of the Company’s inventory for the periods indicated:
|  | September 30, 2019 |  | December 31, 2018
Raw materials |  | $ | 1,853 |  |  | $ | 1,431 |
Work in progress |  | 10,870 |  |  | 9,324 |
Finished goods |  | 4,384 |  |  | 5,362 |
Total inventory |  | $ | 17,107 |  |  | $ | 16,117 |

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