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Equity-based Awards - Additional Information (Detail)
$ / shares in Units, $ in Millions
5 Months Ended 7 Months Ended 12 Months Ended
Aug. 06, 2019
$ / shares
shares
Aug. 05, 2019
shares
Mar. 07, 2019
shares
Dec. 31, 2019
$ / shares
shares
Aug. 05, 2019
shares
Dec. 31, 2020
USD ($)
Installment
$ / shares
shares
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common stock, par value | $ / shares       $ 0.01   $ 0.01 $ 0.01  
TSUs [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Unrecognized compensation cost | $           $ 0.3    
Weighted-average period of unrecognized compensation cost           1 year 3 months 18 days    
PSUs [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Unrecognized compensation cost | $           $ 0.1    
Weighted-average period of unrecognized compensation cost           1 year 4 months 24 days    
Decrease in share targets | $ / shares           $ 0.25    
PSUs [Member] | Market Vesting Date [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock units vesting percentage           50.00%    
PSUs [Member] | First Anniversary Market-Vesting Date [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock units vesting percentage           25.00%    
PSUs [Member] | Second Anniversary Market-Vesting Date [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Stock units vesting percentage           25.00%    
Midstates Restricted Stock Units [Member] | Market Condition Awards [Member] | Non-Employee Director [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Shares outstanding   585,547   0 585,547   0  
Shares vested   585,547            
Midstates 2019 Performance Stock Units                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Shares outstanding       0     0  
Shares granted     193,921          
Shares cancelled             193,921  
Midstates Non-Employee Director Restricted Stock Units | Market Condition Awards [Member] | Non-Employee Director [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Shares outstanding   50,864   0 50,864   0  
Shares vested   50,864            
Midstates 2016 Long Term Incentive Plan [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Shares available for future distribution (in shares)           2,167,996    
Shares outstanding   54,365   0 54,365   0  
Shares vested             54,365  
Vesting period             3 years  
Expiration period             10 years  
2017 Non-Employee Directors Compensation Plan [Member] | Restricted Stock Units (RSUs)                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Merger conversion ratio [1] 0.933              
Shares available for future distribution (in shares)           104,503    
Weighted-average period of unrecognized compensation cost           1 year 3 months 18 days    
Number of vesting annually equal installments | Installment           3    
Vesting date description           Awards granted generally vest annually in three equal installments on each of the first three anniversaries of the grant date, subject to the grantee’s continued employment through each such vesting date.    
Shares outstanding 30,616 [2] 32,814   16,157 32,814 8,898 16,157 39,604
Shares vested       14,459 49,723 7,259    
Shares granted       0 42,933 [3] 0    
Shares cancelled       0 0 0    
2017 Non-Employee Directors Compensation Plan [Member] | Restricted Stock Units (RSUs) | Maximum [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Unrecognized compensation cost | $           $ 0.1    
Legacy Amplify [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common stock, par value | $ / shares $ 0.0001              
Merger conversion ratio 0.933              
Shares available for future distribution (in shares)           1,046,698    
[1]

The merger ratio used to convert Legacy Amplify Board RSUs into newly issued Company Board RSUs.

[2] This reflects the unvested Board RSU awards converted into newly issued Board RSUs at August 6, 2019 in which the stock price was at $5.12 per share.
[3]

The aggregate grant date fair value of Board RSUs issued for the period from January 1, 2019 through August 5, 2019 was $0.3 million based on a grant date market price of $6.95 per share.