I didn't include the breakdown for the sake of brevity (and also because with only 3 categories it is quite nebulous) but here you go.

  In thousands, except percentage

                             |  2019   |  2020    | YoY
  ---------------------------|---------|----------|-----
  research and development   | $56,364 | $76,784  | 36%
  sales and marketing        | $57,042 | $107,249 | 88%
  general and administrative | $29,810 | $37,215  | 25%

Wow, didn't expect them to spend so much money on marketing. Given that they are now registered as a public benefit corporation wouldn't this money be better spent as "scholarships" or something for their courses for students who can't afford the fees. I would assume that if they are actually providing a worthwhile public service, then word of mouth should bring in enough users rather than having to spend most of their opex on marketing.

Rent, marketing, affiliates, IP, etc