DEBT - Royalty Rights Obligation (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Debt Instrument [Line Items] | ||
| Long-term debt | $ 73,493,000 | $ 84,118,000 |
| Royalty rights obligation | Royalty, Current | ||
| Debt Instrument [Line Items] | ||
| Accrued royalties | 2,600,000 | |
| Royalty rights obligation | Royalty, Noncurrent | ||
| Debt Instrument [Line Items] | ||
| Accrued royalties | $ 100,000 | |
| Royalty rights obligation | Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Royalty percentage | 1.50% | |
| Long-term debt | $ 2,743,000 | $ 3,533,000 |