Annual report pursuant to Section 13 and 15(d)

Property and Equipment - Additional Information (Details)

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Property and Equipment - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]      
Depreciation expense $ 493,000 $ 587,000 $ 436,000
Loss on disposal of fixed assets   $ 39,000  
Minimum      
Property Plant And Equipment [Line Items]      
Property and equipment, estimated useful Life 3 years    
Maximum      
Property Plant And Equipment [Line Items]      
Property and equipment, estimated useful Life 15 years    
Tenant Improvement | Minimum      
Property Plant And Equipment [Line Items]      
Property and equipment, estimated useful Life 6 years    
Tenant Improvement | Maximum      
Property Plant And Equipment [Line Items]      
Property and equipment, estimated useful Life 10 years    
Other Property and Equipment | Minimum      
Property Plant And Equipment [Line Items]      
Property and equipment, estimated useful Life 3 years    
Other Property and Equipment | Maximum      
Property Plant And Equipment [Line Items]      
Property and equipment, estimated useful Life 15 years