Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies Lease Narrative (Details)

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Commitments and Contingencies Lease Narrative (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]    
Gain (Loss) on Termination of Lease $ 0 $ 21,000
Sublease Income $ 0 38,000
Lessee, Finance Lease, Term of Contract 3 years  
Lessee, Operating Lease, Term of Contract 4 years  
Lessee, Operating Lease, Number Of Offices 2  
Lessee, Operating Lease, Renewal Term 5 years  
Minneapolis Headquarters [Member]    
Lessee, Lease, Description [Line Items]    
Gain (Loss) on Termination of Lease   $ 21,000