FAIR VALUE MEASUREMENTS - Summary of Change in Liability Balance Associated with Liability-Classified Warrants (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Warrant Liability | ||
| Change in the Fair Value of Warrants | ||
| Balance at beginning of period | $ 1,383 | $ 89,169 |
| Warrant exercises | 0 | (59,907) |
| Increase (decrease) in fair value | (1,268) | (27,879) |
| Balance at end of period | 115 | 1,383 |
| Vegas.com LLC | Earnout Payment Liabilities | ||
| Contingent Consideration | ||
| Balance at beginning of period | 990 | 1,930 |
| Payments | (8) | (1,000) |
| Change in fair value of contingent consideration | 10 | 60 |
| Interest accrued on unpaid balance | 94 | 0 |
| Balance at end of period | $ 1,086 | $ 990 |