Is Roku Stock a Buy Now?

Some might say that the buying window for Roku (ROKU 1.16%) stock is closing. Shares of the media-streaming technology pioneer have gained roughly 70% in less than four months. By comparison, the S&P 500 (^GSPC 0.57%) index gained 20% over the same period. Wall Street analysts aren't excited about this stock, and the average price target sits 7% below Roku's current price. And the company isn't even profitable, so how high can that stock chart go anyway?Despite these perfectly reasonable misgivings, I still ...