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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Jun. 30, 2022 | Sep. 30, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2022
Share-based compensation |  |  |  |  |  |  |  |
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares) |  | 37,900,000 |  |  |  |  |  | 42,400,000
Number of available shares (in shares) |  | 4,500,000 |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |  |  |
Award vesting rights percentage |  |  |  | 50.00% |  |  |  |
Award vesting percentage after one year |  |  |  | 50.00% |  |  |  |
Performance Based Stock Units |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 406,501 |  |  |  |
Aggregate fair value of restricted stock units granted |  |  |  | $ 10,000 |  |  |  |
Acuity Data |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Non-cash stock-based compensation expense |  |  |  | 4,800 |  |  |  |
Business combination, contingent consideration, liability, expected costs | $ 1,700 |  |  | 1,700 |  |  |  |
Acuity Data | Accrued Liabilities |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Business combination, contingent consideration, liability | $ 1,400 |  |  | 1,400 |  |  |  |
Restricted Stock | Diablo.AI, Inc. |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Vested in period, fair value |  |  |  | $ 200 |  |  |  |
Outstanding at the end of the period (in shares) | 16,646 |  |  | 16,646 |  | 24,766 |  |
Restricted stock units |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 70,612 | $ 37,810 |  |  |
Restricted stock units | Vesting in four years |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 4,277,207 |  |  |  |
Aggregate fair value of restricted stock units granted |  |  |  | $ 105,500 |  |  |  |
Vesting period |  |  |  | 3 years |  |  |  |
Restricted stock units | Time Based Vesting |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Vested in period, fair value |  |  |  | $ 29,900 |  |  |  |
Granted (in shares) |  |  |  | 4,277,207 |  |  |  |
Forfeited in period (in shares) |  |  |  | 1,237,106 |  |  |  |
Outstanding at the end of the period (in shares) | 5,929,731 |  |  | 5,929,731 |  | 4,176,682 |  |
Restricted stock units | Performance Based Stock Units |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 121,951 |  |  |  |
Aggregate fair value of restricted stock units granted |  |  |  | $ 3,700 |  |  |  |
Restricted stock units | ATS Performance Plan Vesting Total Shareholder Return |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 36,425 |  |
Restricted stock units | ATS Performance Plan Vesting Total Shareholder Return | Minimum |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Award vesting rights percentage |  |  |  |  |  | 0.00% |  |
Restricted stock units | ATS Performance Plan Vesting Total Shareholder Return | Maximum |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Award vesting rights percentage |  |  |  |  |  | 100.00% |  |
Restricted stock units | Performance Shares Vesting Total Shareholder Return |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 49,977 |  |
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 stock |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 406,501 |  |  | 59,634 |
Forfeited in period (in shares) |  |  |  | 146,709 |  |  |  |
Outstanding at the end of the period (in shares) | 709,589 |  |  | 709,589 |  | 584,468 |  |
The total fair value of performance-based restricted stock units |  |  |  | $ 3,000 |  |  |  |
Restricted stock units | Contingent Equity Awards |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Granted (in shares) |  | 338,101 |  |  |  |  |  |
Restricted stock units | Performance Based Stock Units Under Operating Metrics |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 284,550 |  |  |  |
Aggregate fair value of restricted stock units granted |  |  |  | $ 6,300 |  |  |  |
Restricted stock units | Performance Based Stock Units Under Operating Metrics | Minimum |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Award vesting rights percentage |  |  |  | 0.00% |  |  |  |
Restricted stock units | Performance Based Stock Units Under Operating Metrics | Maximum |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Award vesting rights percentage |  |  |  | 200.00% |  |  |  |
Restricted stock units | 2021 Performance Shares That Will Vest Immediately |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Forfeited in period (in shares) |  |  |  | 71,666 |  |  |  |
Outstanding at the end of the period (in shares) | 208,746 |  |  | 208,746 |  |  |  |
Hurdle achievement, percentage |  |  |  | 50.00% |  |  |  |
Restricted stock units | 2021 Performance Shares That Will Vest In One Year |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |  |  |
Restricted stock units | Diablo.AI, Inc. |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 0 | 660 |  |  |
Performance stock | Contingent Equity Awards |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Granted (in shares) |  | 284,550 |  |  |  |  |  |
Employee stock purchase plan |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 1,527 | $ 1,282 |  |  |
Stock issued during period, ESPP, value |  |  |  | $ 4,000 |  |  |  |
Stock issued during period, ESPP (in shares) |  |  |  | 197,255 |  |  |  |
Shares issued, price per share (in dollars per share) | $ 20.38 |  |  | $ 20.38 |  |  |  |
Stock Option and Equity Compensation Plans |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Total shares reserved for issuance since inception of the stock option and equity compensation plans (in shares) |  | 39,100,000 |  |  |  |  |  | 43,600,000
Shares which remained available for future grants (in shares) | 4,100,000 |  |  | 4,100,000 |  |  |  |
2005 Plan |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Share-based compensation expense | $ 7,000 |  |  |  |  |  |  |
Operating Metrics Performance Plan | Restricted stock units |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Vesting period |  |  |  | 1 year |  |  |  |
Award vesting rights percentage |  |  |  | 50.00% |  |  |  |
Forfeited in period (in shares) |  |  |  | 58,312 |  |  |  |
Outstanding at the end of the period (in shares) | 174,930 |  |  | 174,930 |  |  |  |
Operating Metrics Performance Plan Units That Will Vest Immediately | Restricted stock units |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Award vesting rights percentage |  |  |  | 50.00% |  |  |  |
Operating Metrics Performance Plan Units That Will Vest In One Year | Restricted stock units |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Award vesting rights percentage |  |  |  | 50.00% |  |  |  |
2021 Performance Shares That Will Vest Immediately | Restricted stock units |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Award vesting rights percentage |  |  |  | 50.00% |  |  |  |
2021 Performance Shares That Will Vest In One Year | Restricted stock units |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Award vesting rights percentage |  |  |  | 50.00% |  |  |  |
2019 Operating Metrics Performance Plan | Restricted stock units |  |  |  |  |  |  |  |
Share-based compensation |  |  |  |  |  |  |  |
Award vesting rights percentage |  |  | 96.00% |  |  |  |  |
Forfeited in period (in shares) |  |  | 243,378 |  |  |  |  |

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