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Organization and Description of Business	6 Months Ended
Organization and Description of Business	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business Castle Biosciences, Inc. (the ‘‘Company’’, “we”, “us”, or “our”) was incorporated in the state of Delaware on September 12, 2007. We are a commercial-stage dermatological cancer company focused on providing physicians and their patients with personalized, clinically actionable genomic information to make more accurate treatment decisions. We are based in Friendswood, Texas (a suburb of Houston, Texas) and essentially all of our laboratory operations are conducted at our facilities located in Phoenix, Arizona. Impact of COVID-19 Pandemic Since the COVID-19 pandemic began in March 2020, we have maintained uninterrupted business operations with normal turnaround times for delivery of test reports, but have experienced declines in test report volume in certain periods, which we believe is linked to delays and/or cancellations in patient visits in response to COVID-19, resulting in reduced diagnostic biopsies and thus reduced diagnoses of cutaneous melanoma. The extent to which COVID-19 may further impact our business, consolidated results of operations, consolidated financial condition and consolidated cash flows will depend on future developments, which are highly uncertain and cannot be predicted with confidence.