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Document And Entity Information
 3 Months Ended
Mar. 31, 2021
Document Information Line Items  
Entity Registrant Name BCTG Acquisition Corp.
Document Type S-4/A
Amendment Flag true
Amendment Description This amendment No. 3 to the Registration Statement on Form S-4 is being filed solely to include certain exhibits to the Registration Statement as indicated in the Exhibit Index contained in Part II of the Registration Statement.
Entity Central Index Key 0001819133
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Incorporation, State or Country Code DE