Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation and Other Benefit Plans - Summary of Share-Based Compensation Expense (Details)

v3.20.2
Share-Based Compensation and Other Benefit Plans - Summary of Share-Based Compensation Expense (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2017
tranche
Sep. 30, 2020
USD ($)
shares
Sep. 30, 2019
USD ($)
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
$ / shares
shares
Sep. 30, 2017
$ / shares
Dec. 31, 2019
Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based compensation | $   $ 800 $ 1,000 $ 2,582 $ 3,101      
Defined Contribution Plan, Cost | $   100 200 500 500      
Other Pension, Postretirement and Supplemental Plans [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | $   $ 100 $ 100 $ 100 $ 100      
Time Vested Restricted Stock Units - Employees [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   281,382   281,382        
Restricted Stock Units (RSUs) [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   584,497 9,707 584,497 9,707      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 4.49 $ 30.65      
Shares, Issued   45,435 42,534 45,435 42,534      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   319,280   319,280        
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   57,500   57,500        
Restricted Stock Units (RSUs) [Member] | Minimum [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangements By Share-based Payment Award, Award Amortization Period       1 year        
Restricted Stock Units (RSUs) [Member] | Maximum [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangements By Share-based Payment Award, Award Amortization Period       5 years        
Performance Shares [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   145,399 0 145,399 0      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate             49.90%  
Share-based Compensation Arrangements By Share-based Payment Award, Award Amortization Period       5 years        
Shares, Issued   19,402   19,402        
Share-based Compensation Arrangements By Share-based Payment Award, Performance Period 5 years              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate       0.00%     0.00% 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   201,491   201,491        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum       0.18%     1.66% 1.44%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum       0.51%       1.51%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number   186,595   186,595        
Performance Shares [Member] | Share-based Payment Arrangement, Employee [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   57,500   57,500        
Performance Shares [Member] | Minimum [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate       101.32%       59.63%
Share-based Compensation Arrangements By Share-based Payment Award, Number Of Award Tranches | tranche 2              
Share-based Compensation Arrangement by Share-based Payment Award, Shares, Expected to Vest, Percentage       0.00%        
Performance Shares [Member] | Maximum [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate       117.71%       62.18%
Share-based Compensation Arrangements By Share-based Payment Award, Number Of Award Tranches | tranche 3              
Share-based Compensation Arrangement by Share-based Payment Award, Shares, Expected to Vest, Percentage       200.00%        
Performance Shares [Member] | Year 1 [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares         $ 34.02      
Performance Shares [Member] | Year 1 [Member] | Minimum [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 2.40   $ 47.70    
Performance Shares [Member] | Year 1 [Member] | Maximum [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 16.02   $ 65.28    
Employees and Directors [Member]                
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   1,424,600   1,424,600