<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2026"
  xmlns:ffd="http://xbrl.sec.gov/ffd/2026"
  xmlns:iso4217="http://www.xbrl.org/2003/iso4217"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    <link:schemaRef
      xlink:href="https://xbrl.sec.gov/ffd/2026/ffd-2026.xsd"
      xlink:type="simple"/>
    <context id="rc">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001720893</identifier>
        </entity>
        <period>
            <startDate>2026-03-27</startDate>
            <endDate>2026-03-27</endDate>
        </period>
    </context>
    <context id="offrl_1">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001720893</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>1</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-03-27</startDate>
            <endDate>2026-03-27</endDate>
        </period>
    </context>
    <context id="offrl_2">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001720893</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>2</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-03-27</startDate>
            <endDate>2026-03-27</endDate>
        </period>
    </context>
    <context id="offrl_3">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001720893</identifier>
            <segment>
                <xbrldi:typedMember dimension="ffd:OfferingAxis">
                    <dei:lineNo>3</dei:lineNo>
                </xbrldi:typedMember>
            </segment>
        </entity>
        <period>
            <startDate>2026-03-27</startDate>
            <endDate>2026-03-27</endDate>
        </period>
    </context>
    <unit id="USD">
        <measure>iso4217:USD</measure>
    </unit>
    <unit id="pure">
        <measure>pure</measure>
    </unit>
    <unit id="Shares">
        <measure>shares</measure>
    </unit>
    <ffd:FormTp contextRef="rc" id="ixv-210">S-8</ffd:FormTp>
    <ffd:SubmissnTp contextRef="rc" id="ixv-211">S-8</ffd:SubmissnTp>
    <ffd:FeeExhibitTp contextRef="rc" id="ixv-212">EX-FILING FEES</ffd:FeeExhibitTp>
    <dei:EntityCentralIndexKey contextRef="rc" id="ixv-213">0001720893</dei:EntityCentralIndexKey>
    <dei:EntityRegistrantName contextRef="rc" id="ixv-214">BioXcel Therapeutics, Inc.</dei:EntityRegistrantName>
    <ffd:OfferingTableNa contextRef="rc" id="hiddenrcOfferingTableNa" xsi:nil="true"/>
    <ffd:OffsetTableNa contextRef="rc" id="hiddenrcOffsetTableNa">N/A</ffd:OffsetTableNa>
    <ffd:PrevslyPdFlg contextRef="offrl_1" id="ixv-217">false</ffd:PrevslyPdFlg>
    <ffd:PrevslyPdFlg contextRef="offrl_2" id="ixv-218">false</ffd:PrevslyPdFlg>
    <ffd:PrevslyPdFlg contextRef="offrl_3" id="ixv-219">false</ffd:PrevslyPdFlg>
    <ffd:FormTp contextRef="rc" id="ixv-262">S-8</ffd:FormTp>
    <dei:EntityRegistrantName contextRef="rc" id="ixv-263">BioXcel Therapeutics, Inc.</dei:EntityRegistrantName>
    <ffd:OfferingSctyTp contextRef="offrl_1" id="ixv-264">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_1" id="ixv-265">Common stock, $0.001 par value per share, 2020 Incentive Award Plan</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_1" id="ixv-266">true</ffd:FeesOthrRuleFlg>
    <ffd:AmtSctiesRegd
      contextRef="offrl_1"
      decimals="0"
      id="ixv-267"
      unitRef="Shares">119000</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty
      contextRef="offrl_1"
      decimals="2"
      id="ixv-268"
      unitRef="USD">2.01</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric
      contextRef="offrl_1"
      decimals="2"
      id="ixv-269"
      unitRef="USD">239190.00</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="offrl_1"
      decimals="7"
      id="ixv-270"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_1"
      decimals="2"
      id="ixv-271"
      unitRef="USD">33.03</ffd:FeeAmt>
    <ffd:OfferingSctyTp contextRef="offrl_2" id="ixv-272">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_2" id="ixv-273">Common stock, $0.001 par value per share, 2020 Incentive Award Plan</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_2" id="ixv-274">true</ffd:FeesOthrRuleFlg>
    <ffd:AmtSctiesRegd
      contextRef="offrl_2"
      decimals="0"
      id="ixv-275"
      unitRef="Shares">774110</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty
      contextRef="offrl_2"
      decimals="3"
      id="ixv-276"
      unitRef="USD">1.435</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric
      contextRef="offrl_2"
      decimals="2"
      id="ixv-277"
      unitRef="USD">1110847.85</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="offrl_2"
      decimals="7"
      id="ixv-278"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_2"
      decimals="2"
      id="ixv-279"
      unitRef="USD">153.41</ffd:FeeAmt>
    <ffd:OfferingSctyTp contextRef="offrl_3" id="ixv-280">Equity</ffd:OfferingSctyTp>
    <ffd:OfferingSctyTitl contextRef="offrl_3" id="ixv-281">Common stock, $0.001 par value per share, 2020 Employee Stock Purchase Plan</ffd:OfferingSctyTitl>
    <ffd:FeesOthrRuleFlg contextRef="offrl_3" id="ixv-282">true</ffd:FeesOthrRuleFlg>
    <ffd:AmtSctiesRegd
      contextRef="offrl_3"
      decimals="0"
      id="ixv-283"
      unitRef="Shares">223277</ffd:AmtSctiesRegd>
    <ffd:MaxOfferingPricPerScty
      contextRef="offrl_3"
      decimals="3"
      id="ixv-284"
      unitRef="USD">1.435</ffd:MaxOfferingPricPerScty>
    <ffd:MaxAggtOfferingPric
      contextRef="offrl_3"
      decimals="2"
      id="ixv-285"
      unitRef="USD">320402.49</ffd:MaxAggtOfferingPric>
    <ffd:FeeRate
      contextRef="offrl_3"
      decimals="7"
      id="ixv-286"
      unitRef="pure">0.0001381</ffd:FeeRate>
    <ffd:FeeAmt
      contextRef="offrl_3"
      decimals="2"
      id="ixv-287"
      unitRef="USD">44.25</ffd:FeeAmt>
    <ffd:TtlOfferingAmt contextRef="rc" decimals="2" id="ixv-288" unitRef="USD">1670440.34</ffd:TtlOfferingAmt>
    <ffd:TtlFeeAmt contextRef="rc" decimals="2" id="ixv-289" unitRef="USD">230.69</ffd:TtlFeeAmt>
    <ffd:TtlOffsetAmt contextRef="rc" decimals="2" id="ixv-290" unitRef="USD">0.00</ffd:TtlOffsetAmt>
    <ffd:NetFeeAmt contextRef="rc" decimals="2" id="ixv-291" unitRef="USD">230.69</ffd:NetFeeAmt>
    <ffd:OfferingNote contextRef="offrl_1" id="ixv-292">(a) In accordance with Rule 416(b) under the Securities Act of 1933, as amended (the "Securities Act"), the shares of common stock, par value $0.001 per share (the "Common Stock"), of BioXcel Therapeutics, Inc. (the "Registrant") being registered hereunder include such indeterminate number of shares of the Common Stock as may be issuable with respect to the shares of the Common Stock being registered hereunder as a result of stock splits, stock dividends or similar transactions.

(b) Consists of 893,110 shares of the Registrant's Common Stock that were automatically added to the shares authorized for issuance under the Company's 2020 Incentive Award Plan (as amended, the "2020 Plan") on January 1, 2026 pursuant to an "evergreen" provision contained in the 2020 Plan, of which 119,000 shares were issued upon the exercise of stock options at a weighted average exercise price of $2.01 per share.
</ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_2" id="ixv-293">See Note 1(a)

(a) Consists of shares reserved for future issuance under the 2020 Plan.

(b) Estimated solely for the purpose of calculating the registration fee pursuant to Rules 457(c) and 457(h) of the Securities Act, and based $1.435 per share, which represents the average of the high and low prices of the Registrant's Common Stock on March 24, 2026 as reported on The Nasdaq Capital Market.</ffd:OfferingNote>
    <ffd:OfferingNote contextRef="offrl_3" id="ixv-294">See Note 1(a) and 2(b)

(a) Consists of 223,277 shares of the Registrant's Common Stock that were automatically added to the shares authorized for issuance under the Company's 2020 Employee Stock Purchase Plan (as amended, the "2020 ESPP") on January 1, 2026 pursuant to an "evergreen" provision contained in the 2020 ESPP.</ffd:OfferingNote>
</xbrl>
