Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY - The activity for stock subject to vesting (Details)

v3.20.4
STOCKHOLDERS' EQUITY - The activity for stock subject to vesting (Details) - Restricted stock
shares in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Shared subject to vesting  
Balance at beginning of period, unvested shares (in shares) | shares 5,587
Vested (in shares) | shares (5,307)
Balance at end of period, unvested shares (in shares) | shares 280
Weighted Average Grant Date Fair Value  
Balance at beginning of Period, unvested shares (in dollars per share) | $ / shares $ 0.0001
Vested (in dollars per share) | $ / shares 0.001
Balance at end of Period, unvested shares (in dollars per share) | $ / shares $ 0.001