INVESTMENTS AND FAIR VALUE MEASUREMENT - Debt Securities Available For Sale (Details) - USD ($) $ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | ||
| Amortized Cost | $ 27,203 | |
| Unrealized Gains | 0 | |
| Unrealized Losses | (14) | |
| Fair Value | 27,189 | $ 0 |
| Asset-backed securities | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Amortized Cost | 5,082 | |
| Unrealized Gains | 0 | |
| Unrealized Losses | (4) | |
| Fair Value | 5,078 | |
| Commercial paper | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Amortized Cost | 13,717 | |
| Unrealized Gains | 0 | |
| Unrealized Losses | 0 | |
| Fair Value | 13,717 | |
| Corporate bonds | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Amortized Cost | 7,392 | |
| Unrealized Gains | 0 | |
| Unrealized Losses | (8) | |
| Fair Value | 7,384 | |
| Government bonds | ||
| Debt Securities, Available-for-sale [Line Items] | ||
| Amortized Cost | 1,012 | |
| Unrealized Gains | 0 | |
| Unrealized Losses | (2) | |
| Fair Value | $ 1,010 |