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STOCKHOLDERS' EQUITY: - Performance-based restricted stock units (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Jul. 16, 2020
Acuity Data |  |  |  |  |
Share-based compensation |  |  |  |  |
Business combination, contingent consideration arrangements, range of outcomes, value, high |  |  |  |  | $ 5,100
Business combination, contingent consideration, liability | $ 2,208 | $ 2,208 | $ 0 |  |
Acuity Data | Accrued Liabilities |  |  |  |  |
Share-based compensation |  |  |  |  |
Business combination, contingent consideration, liability | $ 2,200 | $ 2,200 |  |  |
Restricted stock units | Performance stock |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  | 246,524 | 202,818 | 534,438 |
Aggregate fair value of restricted stock units granted |  | $ 10,700 | $ 12,300 | $ 22,000 |
Vesting in period (in shares) |  | 122,573 |  |  |
Forfeited in period (in shares) |  | 36,247 |  |  |
Outstanding at the end of the period (in shares) | 631,869 | 631,869 | 545,446 |  |
The total fair value of performance-based restricted stock units |  | $ 8,400 | $ 2,200 |  |
Restricted stock units | Performance Shares Vesting Total Shareholder Return |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  | 73,950 | 60,844 |  |
Aggregate fair value of restricted stock units granted |  | $ 4,200 | $ 4,400 |  |
Restricted stock units | Performance Shares Vesting Total Shareholder Return | Minimum |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage |  | 0.00% | 0.00% |  |
Restricted stock units | Performance Shares Vesting Total Shareholder Return | Maximum |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage |  | 200.00% | 200.00% |  |
Restricted stock units | Performance Shares Vesting Under The Second Plan |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  | 172,574 | 141,974 |  |
Aggregate fair value of restricted stock units granted |  | $ 6,500 | $ 7,900 |  |
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) |  |  | 82,494 |  |
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 | Performance Shares Vesting Over Two Periods the Second Quarter of Fiscal Year 2022 |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage | 57.00% |  |  |  |
Forfeited in period (in shares) | 177,181 |  |  |  |
Outstanding at the end of the period (in shares) | 432,652 | 432,652 |  |  |
Restricted stock units | 2021 Performance Shares That Will Vest Immediately |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage |  | 50.00% |  |  |
Restricted stock units | Vesting Based on Relevant Performance Period Over Two Periods at March 31 2022 | Minimum |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage |  |  | 0.00% |  |
Restricted stock units | Vesting Based on Relevant Performance Period Over Two Periods at March 31 2022 | Maximum |  |  |  |  |
Share-based compensation |  |  |  |  |
Award vesting rights percentage |  |  | 200.00% |  |
Restricted stock units | Vesting Based On Relevant Performance Period For First Performance Plan At March 31 2019 |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  |  |  | 186,539 |
Aggregate fair value of restricted stock units granted |  |  |  | $ 5,800 |
Restricted stock units | Vesting Based On Relevant Performance Period For First Performance Plan At March 31 2019 | Minimum |  |  |  |  |
Share-based compensation |  |  |  |  |
Equity instrument other than options, percentage of vesting |  |  |  | 25.00% |
Restricted stock units | Vesting Based On Relevant Performance Period For First Performance Plan At March 31 2019 | Maximum |  |  |  |  |
Share-based compensation |  |  |  |  |
Equity instrument other than options, percentage of vesting |  |  |  | 200.00% |
Restricted stock units | Vesting Based On Relevant Performance Period For Second Performance Plan At March 31 2019 |  |  |  |  |
Share-based compensation |  |  |  |  |
Granted (in shares) |  |  |  | 347,899 |
Aggregate fair value of restricted stock units granted |  |  |  | $ 16,200 |
Restricted stock units | Vesting Based On Relevant Performance Period For Second Performance Plan At March 31 2019 | Minimum |  |  |  |  |
Share-based compensation |  |  |  |  |
Equity instrument other than options, percentage of vesting |  |  |  | 0.00% |
Restricted stock units | Vesting Based On Relevant Performance Period For Second Performance Plan At March 31 2019 | Maximum |  |  |  |  |
Share-based compensation |  |  |  |  |
Equity instrument other than options, percentage of vesting |  |  |  | 200.00% |
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 Based On Attainment Of The Year-Over-Year Revenue Growth Targets |  |  |  |  |
Share-based compensation |  |  |  |  |
Vesting in period (in shares) |  |  | 59,480 |  |
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% |  |  |

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