It's been something of a roller-coaster ride for investors in Atlassian (NASDAQ: TEAM). In the little more than three years since its public debut, the collaborative software maker has quadrupled in value -- but those gains haven't all come in a straight line. During the year-end market malaise that hit stocks to close out 2018, Atlassian lost nearly a third of its value, but has since come roaring back, recently touching all-time highs.