For some businesses it is as long as you can keep feeding the...

For some businesses it is as long as you can keep feeding the cash eating monster until you can get to wash your face.
But however you charactise it RNT management seems did not recognise the capital required to get to breakeven or even worse assumed they could tap the market for capital at the drop of the hat whenever they needed to top up the bank account and now are at serious risk of a debilitating cycle of diluting wash, rinse, dry capital raisings at lower and lower prices.
If history is any guide to these things a good read is a book call "dot.bomb: My days and Nights at an Internet Goliath" by J David Kuo written after the colapse of the last internet bubble.