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STOCK-BASED COMPENSATION - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) tranche component shares | Dec. 31, 2019 USD ($) shares | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 7,451 | $ 10,201 |
Exercise of employee stock options, net of shares withheld for employee taxes (in shares) | shares | 0 |  |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of units vested | 0.00% |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of units vested | 200.00% |  |
Contract Drilling Services Operating Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 1,800 | 2,400 |
Selling, General and Administrative Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | 5,400 | $ 7,800 |
Research and Development Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 300 |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period over which awards expire | 10 years |  |
Awards granted (in shares) | shares | 0 | 0 |
Stock-based compensation expense | $ 318 | $ 571 |
Exercise of employee stock options, net of shares withheld for employee taxes (in shares) | shares | 0 |  |
Total intrinsic value of options exercised |  | 300 |
Unrecognized compensation cost related to stock options | $ 900 |  |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 1 year |  |
Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 6,011 | 7,370 |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years 7 months 6 days |  |
Vesting period | 3 years |  | 4 years
Unrecognized compensation cost related to non-option awards | $ 41,600 |  |
Restricted Stock Awards | 2020 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards granted (in shares) | shares | 631,166 |  |
Performance Share Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 1,122 | $ 2,260 |
Weighted average period over which unrecognized compensation cost is expected to be recognized | 2 years 7 months 6 days |  |
Vesting period | 3 years |  |
Unrecognized compensation cost related to non-option awards | $ 14,600 |  |
Performance components | component | 2 |  |
Performance Share Units | 2020 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards granted (in shares) | shares | 312,600 |  |
Performance Share Units - First Component |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period over which awards expire | 3 years |  |
Performance Share Units - Second Component |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period over which awards expire | 3 years |  |
Number of tranches | tranche | 3 |  |
Performance cycle period of each tranche | 1 year |  |

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