Craig-Hallum analyst Richard Shannon said he believes the "dominant driver" of Ambarella's (AMBA) recent strength has been enthusiasm for historical top customer GoPro (GPRO), while raising his F17/18 estimates for Ambarella based on expectations for a strong inventory build ahead of introductions later this year from the action camera maker. Shannon raised his price target on Ambarella shares to $85 from $52 ahead of its earnings report on Thursday, but noted that he sees the stock's price correlation with GoPro as an issue. The firm keeps a Buy rating on Ambarella.