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v3.21.2

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Cash and cash equivalents balance outside of FDIC limit | $ 45,962 |  |
Restricted cash | 6,333 |  | $ 6,842
Accounts receivable, allowance for doubtful accounts | 173 |  | 416
Heights Union |  |  |
Balance remaining in the escrow account | $ 83 |  | 842
Minimum |  |  |
Age of doubtful accounts | 30 days |  |
Maximum |  |  |
Age of doubtful accounts | 60 days |  |
Standby Letters of Credit | Heights Union |  |  |
Collateral amount | $ 250 | $ 250 |
Restricted Cash |  |  |
Collateral amount | $ 6,000 |  | $ 6,000

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