SHARE-BASED AWARDS - Stock option activity (Details) - Stock option - USD ($)
$ / shares in Units, $ in Thousands |
12 Months Ended |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Number of Options |
|
|
| Temporary equity, shares outstanding (in shares) |
|
22,633
|
| Retroactive conversion of shares due to Business Combination (in shares) |
|
13,976
|
| Balance at the beginning |
36,609
|
|
| Exercised |
(5,649)
|
|
| Forfeited |
(5,513)
|
|
| Expired |
(1,289)
|
|
| Balance at the end |
24,158
|
36,609
|
| Exercisable at the end |
18,961
|
|
| Weighted-Average Exercise Price |
|
|
| Weighted-Average Exercise Price (in dollars per share) |
|
$ 3.00
|
| Retroactive conversion of shares due to Business Combination (in dollars per share) |
|
(1.15)
|
| Balance at the beginning (in dollars per share) |
$ 1.85
|
|
| Exercised (in dollars per share) |
1.33
|
|
| Forfeited (in dollars per share) |
2.04
|
|
| Expired (in dollars per share) |
2.22
|
|
| Balance at the end (in dollars per share) |
1.91
|
$ 1.85
|
| Exercisable at the end (in dollars per share) |
$ 1.55
|
|
| Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value |
|
|
| Balance (in years) |
5 years 4 months 24 days
|
6 years 10 months 24 days
|
| Exercisable at the end (in years) |
4 years 7 months 6 days
|
6 years 10 months 24 days
|
| Balance (in dollars) |
$ 502,767
|
$ 110,481
|
| Exercisable at the end (in dollars) |
$ 401,436
|
|