's (NASDAQ: ROKU) stock has been unstoppable lately, doubling in price since the start of the year.

Investors who missed the early rally may contemplate buying into the stock. But before they rush into making a hasty decision, they must know what might have caused the stock to outperform in the last few months.

Knowing how it got here will better position us to forecast where the company (and stock) could go from here.

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Source Fool.com