I think losing $1.9 billion on $1.8 billion in revenue in 2018 (yes, I know it's more complicated than that) has made getting additional capital more difficult. At the same time a self-dealing CEO gives the appearance to investors that he might not be confident that his normal compensation/stock will be worth that much, hence the extraction of value in other ways, leading to concerns about corporate governance that makes private capital more reluctant still. So the IPO is necessary to raise capital, not just to give early investors a soft exit. Now its catching up to them a bit too soon for a maximal IPO, so they're rethinking and perhaps a bit desperately (my interpretation only) going back for more private money.