Due to the subtle nature of the insider threat, government bodies and corporate organizations are forced to face the insider threat that is both malicious and accidental. In this paper, we provide a systematic understanding of the past literature that addresses the issues with insider threat detection. Our review consists of three items. First, we examine the different types of insider threats based on insider characteristics and insider activities. Second, we explore the sensors which make

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... ible detecting insider threats in an automated way, and the public datasets available for research. Finally, the detection approaches used in related studies are examined from the perspective of technology, learning, input category, detection target, and interpretability. In particular, we have covered the state-of-the-art deep learning literature that was not covered in previous surveys.