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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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