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Commitments and Contingencies - Concentrations (Details) $ in Thousands | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 USD ($) ft² a | Mar. 31, 2020 USD ($) item | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Jul. 09, 2019 USD ($) | Sep. 30, 2018 ft²
Concentrations |  |  |  |  |  |
Size of building space | ft² | 70,000 |  |  |  |  |
Area of land where building resides | a | 8.6 |  |  |  |  |
Payments to acquire Land | $ 731 |  |  |  |  |
Payments to acquire Building | $ 4,300 |  |  |  |  |
Estimated cost relating to design build agreement |  | $ 4,457 |  |  | $ 29,000 |
Additional costs associated with design build agreement |  |  |  |  | 13,000 |
Construction in progress. |  | 10,523 |  |  |  |
Acquisition of fixed assets in accounts payable and accrued expenses |  | 3,674 | $ 946 |  |  |
Heights Union |  |  |  |  |  |
Concentrations |  |  |  |  |  |
Area of land where building resides | ft² |  |  |  |  |  | 75,000
Expenses related to improvements |  | 494 | $ 935 |  |  |
Design build agreement |  |  |  |  |  |
Concentrations |  |  |  |  |  |
Proceeds from grants |  | $ 238 |  |  |  |
Maximum | Design build agreement |  |  |  |  |  |
Concentrations |  |  |  |  |  |
Receivable economic development grants from state and local authorities |  |  |  |  | 2,685 |
Cash grants |  |  |  |  | $ 1,250 |
Expected | Maximum | Heights Union |  |  |  |  |  |
Concentrations |  |  |  |  |  |
Expenses related to improvements |  |  |  | $ 7,800 |  |
Vendor |  |  |  |  |  |
Concentrations |  |  |  |  |  |
Number of products from which revenue is derived | item |  | 4 |  |  |  |

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