Annual report pursuant to Section 13 and 15(d)

Income Taxes - Narrative (Details)

v3.20.4
Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Loss Carryforwards [Line Items]    
Valuation allowance of deferred tax assets, net $ 336 $ 510
Amount of valuation allowance determined to release   $ 10,300
Federal income tax    
Operating Loss Carryforwards [Line Items]    
Operating loss $ 23,700  
Federal income tax | Minimum    
Operating Loss Carryforwards [Line Items]    
Operating loss, expiration date Dec. 31, 2035  
Federal income tax | Maximum    
Operating Loss Carryforwards [Line Items]    
Operating loss, expiration date Dec. 31, 2039  
Federal income tax | Tax year 2035 to 2037    
Operating Loss Carryforwards [Line Items]    
Operating loss $ 16,000  
Federal income tax | Tax year, no expiration    
Operating Loss Carryforwards [Line Items]    
Operating loss $ 7,700  
State income tax | Minimum    
Operating Loss Carryforwards [Line Items]    
Operating loss, expiration date Dec. 31, 2035  
State income tax | Maximum    
Operating Loss Carryforwards [Line Items]    
Operating loss, expiration date Dec. 31, 2039