It seems TSG was bleeding around $7M per quarter, and legal fees with Boies, Schiller & Flexner LLP were capped at $31M [0]. Microsoft seems to paid more than $6M, eg. this article [1] cites $16.6M figure. It should be possible to check these amounts in SEC fillings, but it is cumbersome, there isn't single summary table but multiple fillings mention various payments in different quarters. [2]

It seems that licensing fees from Microsoft were not insignificant part of litigation costs.

[0] https://www.computerworld.com/article/2566954/sco-caps-legal... [1] https://www.computerworld.com/article/2563673/update--micros... [2] https://www.sec.gov/edgar/search/#/q=Microsoft&dateRange=all...