Annual report pursuant to Section 13 and 15(d)

Separation Charges (Details)

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Separation Charges (Details) - USD ($)
$ in Thousands
12 Months Ended
May 24, 2019
May 11, 2018
Dec. 31, 2019
Dec. 31, 2018
Separation Charges        
Separation expenses     $ 100 $ 2,446
Former Chairman of the Board, President and Chief Executive Officer | 2018 Separation Agreement        
Separation Charges        
Cash payments to be paid in the next 12 months   $ 700    
Period for consecutive equal monthly installments   12 months    
Accelerated vesting of restricted stock grants       1,700
Lump sum cash payment   $ 30    
Separation expenses     0 2,400
Employee severance cash payments       700
Payment of accrued vacation   $ 40    
Vested (in shares)   109,084    
Former Chairman of the Board, President and Chief Executive Officer | 2018 Separation Agreement | Maximum        
Separation Charges        
Period of lump sum payment   30 days    
Former Chairman of the Board, President and Chief Executive Officer | 2019 Separation Agreement        
Separation Charges        
Period for consecutive equal monthly installments 6 months      
Lump sum cash payment $ 100      
Separation expenses     $ 100 $ 0