Before the Susan fowler thing they had a rule that you had 30 days to exercise your options after you leave or separate as they called it. Since the company's value went up so much most people couldn't afford to pay the tax and because it was private you couldn't sell it (employee lock out is in November). Lots of people were handcuffed because of this, and I know a few that walked away. After the Susan Fowler thing they changed the option thing to like 7 years.

I think they moved to RSU's in mid 2015 or 16.