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Loan Payable - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 15, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Loan payable |  | $ 14,915 | $ 14,915 | $ 0
Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 35,000 |  |  |
Maturity Date | Aug. 01, 2025 |  |  |
Percentage Bearing Variable Interest, Percentage Rate | 7.15% |  |  |
Basis Spread on Variable Rate | 7.00% |  |  |
Interest Rate Terms | Index Rate is the greater of (i) 30-day US LIBOR or (ii) 0.15%. |  |  |
Thershold Index Rate | 0.15% |  |  |
Debt Instrument, Periodic Payment, Principal | $ 500 |  |  |
Debt Instrument, Date of First Required Payment | Mar. 01, 2023 |  |  |
Payments of Debt Issuance Costs | $ 96 |  |  |
Loan payable |  | 14,915 | 14,915 |
Total interest expense |  | $ 276 | $ 507 |
Tranch A Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | 15,000 |  |  |
Tranch B Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | 10,000 |  |  |
Thershold Series C Equity Capital Funding | $ 50,000 |  |  |
Debt Instrument, Covenant Description | receipt of at least $50,000 in Series C equity capital, ii) initiation of the Phase 1 combination study of TPST-1495 or monotherapy expansion study, and iii) initiation of Phase 2 trial of TPST-1120 or the 1L Triplet Collaboration study. |  |  |
Tranch C Term Loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount | $ 10,000 |  |  |

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- Definition Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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