I found some financial figures reported by Elektron Music Machines AB. For 2019 they have reported sales of about 16 million USD, a loss of 1.8 million, and about 50 employees.
To reach this sales figure, I assume they must have sold about 20,000 boxes for an average sales price of 800 USD (unless I am missing another source of income here).
(For comparison: Arturia (July 2019-June 2020) - 36.6M USD sales, 8.8M USD profit, 74 employees)