Equity Method and Other Investments in Equity Method Investees	9 Months Ended
Sep. 30, 2021
Equity Method And Cost Method Investment [Abstract]
Equity Method and Other Investments in Equity Method Investees	7. Equity Method and Other Investments in Equity Method Investees LianBio LianBio, a related party, is a global and science-driven biopharmaceutical company founded by Perceptive Advisors. LianBio is focused on sourcing the best opportunities and creating new therapeutic paradigms for first-in-class programs to bring the world’s leading science to Greater China and major Asian markets. In October 2019, BBP LLC entered into an exclusivity agreement with LianBio, pursuant to which BBP LLC received equity in LianBio representing a 10% ownership interest, valued at approximately $3.8 million at the time of the transaction. The equity interest was issued in consideration for certain rights of first negotiation and rights of first offer granted by BBP LLC to LianBio with respect to specified transactions covering intellectual property rights owned or controlled by BBP LLC or its affiliates in certain territories outside the United States. The equity interest gave BBP LLC the right to appoint or remove one director to the board of directors of LianBio. This right will terminate in the event that LianBio consummates an IPO. Our 10% ownership interest was reduced to zero as of December 31, 2019 after recognizing our equity share in the net losses of LianBio for the year ended December 31, 2019. As of both September 30, 2021 and December 31, 2020, our equity method investment in LianBio represented approximately 6% of LianBio’s fully-diluted equity. We continue to account for our investment in LianBio under the equity method as we have the right to appoint or remove one director to the board of directors of LianBio, and therefore have significant influence over LianBio. The carrying amount of the investment in LianBio in the condensed consolidated balance sheets represents our maximum loss exposure related to our investment in LianBio. There were no impairments related to the LianBio investment for the three and nine months ended September 30, 2021 and 2020. Pursuant to a License Agreement entered into in October 2019 between QED Therapeutics, Inc. (“QED”) and LianBio, QED also received warrants which entitle QED to purchase 10% of the then-fully diluted shares of one of the subsidiaries of LianBio upon achievement of certain contingent development milestones. In October 2021, the warrants held by QED to purchase shares of one of the subsidiaries of LianBio were converted into a warrant to purchase 347,569 shares of LianBio. On November 1, 2021, LianBio completed its IPO and, as a result, BBP LLC’s ownership in LianBio was reduced to approximately 4.7% of LianBio’s equity. PellePharm On November 19, 2018, PellePharm, Inc. entered into the LEO Agreement, pursuant to which LEO Pharma (“LEO”) was granted an exclusive, irrevocable option to acquire PellePharm. The LEO call option was exercisable by LEO on or before the occurrence of certain events relating to PellePharm’s clinical development programs and no later than July 30, 2021. We accounted for the LEO call option as a current liability (the “LEO Call Option Liability”, see Note 3) in our condensed consolidated financial statements because BridgeBio was obligated to sell its shares in PellePharm to LEO at a pre-determined price, if the option were to be exercised. We remeasured the LEO call option to fair value at each subsequent balance sheet date until the LEO call option either was exercised, terminated or had expired. Prior to the LEO Agreement, BridgeBio consolidated PellePharm under the VIE model. The date the LEO Agreement was entered into was determined to be a VIE reconsideration event. Based on our assessment, we had concluded that PellePharm remained a VIE after the reconsideration event as it did not have sufficient equity at risk to finance its activities without additional subordinated financial support. However, based on the then changes to PellePharm’s governance structure and board of directors composition as a result of the LEO Agreement, BridgeBio was no longer the primary beneficiary as it no longer had the power over the key decisions that most significantly impact PellePharm’s economic performance. Accordingly, BridgeBio deconsolidated PellePharm on November 19, 2018. After the deconsolidation in November 2018, PellePharm was considered a related party of BridgeBio. Subsequent to the deconsolidation of PellePharm in 2018, we accounted for our retained common stock investment as an equity method investment and our retained preferred stock investment as a cost method investment. Upon adoption of ASU 2016-01 in 2019, we accounted for the investment in PellePharm preferred stock as an equity security without a readily determinable fair value. As of December 31, 2020, the aggregate carrying amount of our investments in PellePharm was zero. After the equity method investment was reduced to zero during the three months ended March 31, 2019, BridgeBio subsequently recorded its percentage of net losses consistent with its preferred stock ownership percentage of 61.9% until the equity security investment was also reduced to zero during the remaining period of 2019. The carrying amount of BridgeBio’s investment in PellePharm in the condensed consolidated balance sheets through March 31, 2021 represented its maximum loss exposure related to its VIE investment in PellePharm. There were no impairments related to our PellePharm investment through March 31, 2021. LEO terminated the LEO Agreement effective as of April 15, 2021. The date the LEO Agreement was terminated was determined to be a VIE reconsideration event. Based on our assessment, we continue to conclude that PellePharm remains a VIE after the reconsideration event as it does not have sufficient equity at risk to finance its activities without additional subordinated financial support. Based on the changes to PellePharm’s board of directors composition as a result of the termination of the LEO Agreement, BridgeBio became the primary beneficiary as it has the power over the key decisions that most significantly impact PellePharm’s economic performance and it has the obligation to absorb losses or the right to receive benefits from PellePharm that could potentially be significant to PellePharm through its common and preferred stock interest in PellePharm. Accordingly, BridgeBio consolidated PellePharm effective on April 15, 2021.

Equity Method and Other Investments in Equity Method Investees

9 Months Ended

Sep. 30, 2021

Equity Method And Cost Method Investment [Abstract]

Equity Method and Other Investments in Equity Method Investees

LianBio

LianBio, a related party, is a global and science-driven biopharmaceutical company founded by Perceptive Advisors. LianBio is focused on sourcing the best opportunities and creating new therapeutic paradigms for first-in-class programs to bring the world’s leading science to Greater China and major Asian markets. In October 2019, BBP LLC entered into an exclusivity agreement with LianBio, pursuant to which BBP LLC received equity in LianBio representing a 10% ownership interest, valued at approximately $3.8 million at the time of the transaction. The equity interest was issued in consideration for certain rights of first negotiation and rights of first offer granted by BBP LLC to LianBio with respect to specified transactions covering intellectual property rights owned or controlled by BBP LLC or its affiliates in certain territories outside the United States. The equity interest gave BBP LLC the right to appoint or remove one director to the board of directors of LianBio. This right will terminate in the event that LianBio consummates an IPO.

Our 10% ownership interest was reduced to zero as of December 31, 2019 after recognizing our equity share in the net losses of LianBio for the year ended December 31, 2019. As of both September 30, 2021 and December 31, 2020, our equity method investment in LianBio represented approximately 6% of LianBio’s fully-diluted equity. We continue to account for our investment in LianBio under the equity method as we have the right to appoint or remove one director to the board of directors of LianBio, and therefore have significant influence over LianBio. The carrying amount of the investment in LianBio in the condensed consolidated balance sheets represents our maximum loss exposure related to our investment in LianBio. There were no impairments related to the LianBio investment for the three and nine months ended September 30, 2021 and 2020.

Pursuant to a License Agreement entered into in October 2019 between QED Therapeutics, Inc. (“QED”) and LianBio, QED also received warrants which entitle QED to purchase 10% of the then-fully diluted shares of one of the subsidiaries of LianBio upon achievement of certain contingent development milestones.

In October 2021, the warrants held by QED to purchase shares of one of the subsidiaries of LianBio were converted into a warrant to purchase 347,569 shares of LianBio. On November 1, 2021, LianBio completed its IPO and, as a result, BBP LLC’s ownership in LianBio was reduced to approximately 4.7% of LianBio’s equity.

PellePharm

On November 19, 2018, PellePharm, Inc. entered into the LEO Agreement, pursuant to which LEO Pharma (“LEO”) was granted an exclusive, irrevocable option to acquire PellePharm. The LEO call option was exercisable by LEO on or before the occurrence of certain events relating to PellePharm’s clinical development programs and no later than July 30, 2021. We accounted for the LEO call option as a current liability (the “LEO Call Option Liability”, see Note 3) in our condensed consolidated financial statements because BridgeBio was obligated to sell its shares in PellePharm to LEO at a pre-determined price, if the option were to be exercised. We remeasured the LEO call option to fair value at each subsequent balance sheet date until the LEO call option either was exercised, terminated or had expired.

Prior to the LEO Agreement, BridgeBio consolidated PellePharm under the VIE model. The date the LEO Agreement was entered into was determined to be a VIE reconsideration event. Based on our assessment, we had concluded that PellePharm remained a VIE after the reconsideration event as it did not have sufficient equity at risk to finance its activities without additional subordinated financial support. However, based on the then changes to PellePharm’s governance structure and board of directors composition as a result of the LEO Agreement, BridgeBio was no longer the primary beneficiary as it no longer had the power over the key decisions that most significantly impact PellePharm’s economic performance. Accordingly, BridgeBio deconsolidated PellePharm on November 19, 2018. After the deconsolidation in November 2018, PellePharm was considered a related party of BridgeBio.

Subsequent to the deconsolidation of PellePharm in 2018, we accounted for our retained common stock investment as an equity method investment and our retained preferred stock investment as a cost method investment. Upon adoption of ASU 2016-01 in 2019, we accounted for the investment in PellePharm preferred stock as an equity security without a readily determinable fair value. As of December 31, 2020, the aggregate carrying amount of our investments in PellePharm was zero. After the equity method investment was reduced to zero during the three months ended March 31, 2019, BridgeBio subsequently recorded its percentage of net losses consistent with its preferred stock ownership percentage of 61.9% until the equity security investment was also reduced to zero during the remaining period of 2019. The carrying amount of BridgeBio’s investment in PellePharm in the condensed consolidated balance sheets through March 31, 2021 represented its maximum loss exposure related to its VIE investment in PellePharm. There were no impairments related to our PellePharm investment through March 31, 2021.

LEO terminated the LEO Agreement effective as of April 15, 2021. The date the LEO Agreement was terminated was determined to be a VIE reconsideration event. Based on our assessment, we continue to conclude that PellePharm remains a VIE after the reconsideration event as it does not have sufficient equity at risk to finance its activities without additional subordinated financial support. Based on the changes to PellePharm’s board of directors composition as a result of the termination of the LEO Agreement, BridgeBio became the primary beneficiary as it has the power over the key decisions that most significantly impact PellePharm’s economic performance and it has the obligation to absorb losses or the right to receive benefits from PellePharm that could potentially be significant to PellePharm through its common and preferred stock interest in PellePharm. Accordingly, BridgeBio consolidated PellePharm effective on April 15, 2021.