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Commitments and Contingencies (Details Textual)
$ in Thousands
 12 Months Ended
Aug. 29, 2020
ft²
Feb. 24, 2020
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 01, 2013
ft²
Commitments And Contingencies [Line Items]          
Area of office facilities taken on lease | ft² 5,200       5,300
Additional operating lease term 36 months 6 months      
Lease renewal start date   Apr. 01, 2020      
Lease expiration date   Sep. 30, 2020      
Operating lease term 42 months        
Lease renewal option option to renew for an additional 36 month term at the then prevailing rental rate.        
Lessee, Operating Lease, Existence of Option to Extend [true false] true        
Lessee, operating lease, assumptions and judgments, allocation of lease and nonlease component     The lease includes real estate taxes and insurance, which is not a lease component and is not included in the lease obligation. In addition, common area maintenance charges are based on actual costs incurred and are a non-lease component that is not included in the lease obligation.    
Operating lease, cash paid for measurement of lease liabilities     $ 76 $ 91  
Lease liability     $ 450    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]     us-gaap:OtherAccruedLiabilitiesCurrent    
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]     us-gaap:OperatingLeaseLiabilityNoncurrent    
Weighted-average remaining lease term     6 years 2 months 12 days    
Weighted-average discount rate     7.00%    
General and Administrative Expense          
Commitments And Contingencies [Line Items]          
Rent expense     $ 95 $ 74