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STOCK-BASED COMPENSATION: - Performance-based restricted stock units (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Jul. 16, 2020
Mar. 31, 2020
Acuity Data        
Share-based compensation        
Business combination, contingent consideration arrangements, range of outcomes, value, high     $ 5,100  
Business combination, contingent consideration, liability   $ 1,429   $ 0
Acuity Data | Accrued Liabilities        
Share-based compensation        
Business combination, contingent consideration, liability   $ 1,400    
Restricted stock units | Performance stock        
Share-based compensation        
Granted (in shares)   246,524    
Aggregate fair value of restricted stock units granted   $ 10,700    
Vesting in period (in shares)   121,587    
Forfeited in period (in shares)   34,731    
Outstanding at the end of the period (in shares)   673,715   545,446
The total fair value of performance-based restricted stock units   $ 6,100    
Restricted stock units | Performance Shares Vesting Total Shareholder Return        
Share-based compensation        
Granted (in shares)   73,950    
Aggregate fair value of restricted stock units granted   $ 4,200    
Restricted stock units | Performance Shares Vesting Total Shareholder Return | Minimum        
Share-based compensation        
Award vesting rights percentage   0.00%    
Restricted stock units | Performance Shares Vesting Total Shareholder Return | Maximum        
Share-based compensation        
Award vesting rights percentage   200.00%    
Restricted stock units | Performance Shares Vesting Under The Second Plan        
Share-based compensation        
Granted (in shares)   172,574    
Aggregate fair value of restricted stock units granted   $ 6,500    
Restricted stock units | Performance Shares Vesting Under The Second Plan | Minimum        
Share-based compensation        
Award vesting rights percentage   0.00%    
Restricted stock units | Performance Shares Vesting Under The Second Plan | Maximum        
Share-based compensation        
Award vesting rights percentage   200.00%    
Restricted stock units | Performance Shares Vesting One-Year Anniversary Of Attainment        
Share-based compensation        
Award vesting rights percentage   50.00%    
Vesting period   1 year    
Restricted stock units | Performance Shares Vesting In Three Equal Annual Increments        
Share-based compensation        
Vesting in period (in shares)   59,480    
Forfeited in period (in shares)   38,063    
Restricted stock units | Vesting Based on Relevant Performance Period Over Two Periods at March 31 2020        
Share-based compensation        
Award vesting rights percentage   164.00%    
Forfeited in period (in shares)   97,543    
Restricted stock units | 2020 Performance Shares That Will Vest Immediately        
Share-based compensation        
Award vesting rights percentage   33.00%    
Restricted stock units | 2020 Performance Shares That Vest In Equal Increments In First Quarters Of Fiscal Years 2022 And 2023        
Share-based compensation        
Award vesting rights percentage   67.00%    
Restricted stock units | Performance Shares Vesting Over Two Periods the Second Quarter of Fiscal Year 2022        
Share-based compensation        
Granted (in shares)   307,897    
Award vesting rights percentage 57.00%      
Forfeited in period (in shares) 178,146      
Outstanding at the end of the period (in shares)   437,648    
Restricted stock units | 2019 Performance Shares That Will Vest Immediately        
Share-based compensation        
Award vesting rights percentage   50.00%    
Restricted stock units | 2019 Performance Shares That Will Vest In The Second Quarter Of Fiscal Year 2022        
Share-based compensation        
Award vesting rights percentage   50.00%    
Restricted stock units | 2021 Performance Shares That Will Vest Immediately        
Share-based compensation        
Award vesting rights percentage   50.00%