Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Narrative (Details)

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Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Cash and cash equivalents balance outside of FDIC limit $ 39,343  
Restricted cash 6,333 $ 6,842
Accounts receivable, allowance for doubtful accounts 351 416
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  
Restricted Cash    
Collateral amount $ 6,000 $ 6,000