Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
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 12 Months Ended
Jan. 31, 2017
tranche
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
shares
Dec. 31, 2019
$ / shares
Dec. 31, 2017
$ / shares
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Dividends | $   $ 0 $ 0    
Share-based compensation | $   856 1,038    
Defined Contribution Plan, Cost | $   200 200    
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    
Time Vested Restricted Stock Units [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      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares   $ 2.78      
Shares, Issued   22,321 24,657    
Time Vested Restricted Stock Units [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   2 years      
Time Vested Restricted Stock Units [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 Restricted Stock Units [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   87,899 0    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate   101.32%   49.90%  
Share-based Compensation Arrangements By Share-based Payment Award, Award Amortization Period   5 years      
Share-based Compensation Arrangements By Share-based Payment Award, Performance Period 3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum   0.51%   1.66% 1.44%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum         1.51%
Performance Restricted Stock Units [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         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 Restricted Stock Units [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         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 Restricted Stock Units [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   $ 2.40   $ 34.02  
Performance Restricted Stock Units [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         $ 47.70
Performance Restricted Stock Units [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         $ 65.28
Performance Restricted Stock Units [Domain]          
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   201,491      
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Minimum   0.00%   0.00% 0.00%
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   223,882 0    
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