CONDENSED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Cash Flows From Operating Activities:
Net loss	$ (25,518)	$ (45,460)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation	957	433
Amortization of intangible assets	480	480
Amortization of debt-related costs	325	285
Loss on disposal of property and equipment	183	0
Stock-based compensation	25,256	15,163
Non-cash lease expense	169	323
Gain on exchange of long-term investments	(2,812)	0
Net amortization/accretion of marketable securities	(1,611)	(3,023)
Unrealized (gain) loss from transactions denominated in a foreign currency	(10)	26
Changes in operating assets and liabilities:
Accounts receivable, net	(10,972)	(11,574)
Inventory	2	(1,252)
Other receivables	(207)	(608)
Prepaid expenses	3,861	(14,449)
Other non-current assets	196	227
Accounts payable	23,410	269
Accrued payroll and benefits	(5,892)	(4,212)
Other accrued liabilities	28,754	13,334
Net cash provided by (used in) operating activities	36,571	(50,038)
Cash Flows From Investing Activities:
Proceeds from maturities of marketable securities	118,404	170,218
Purchases of marketable securities	(129,201)	(255,273)
Purchases of property and equipment	(9,887)	(1,591)
Net cash used in investing activities	(20,684)	(86,646)
Cash Flows From Financing Activities:
Proceeds from issuance of common stock, net of paid issuance costs	0	134,771
Proceeds from sale of common stock under employee stock purchase plan	1,438	1,101
Proceeds from exercise of stock options	3,068	2,642
Net cash provided by financing activities	4,506	138,514
Net increase in cash, cash equivalents and restricted cash	20,393	1,830
Cash, cash equivalents and restricted cash at beginning of period	186,203	97,381
Cash, cash equivalents and restricted cash at end of period	206,596	99,211
Supplemental Disclosures From Noncash, Investing and Financing Activities:
Interest expense paid in cash	3,959	4,168
Income taxes paid in cash	4,773	0
Additions of property and equipment included within accounts payable and other accrued liabilities	$ 623	$ 344

Operating Lease, Noncash Expense

No definition available.

Name:	tars_OperatingLeaseNoncashExpense
Namespace Prefix:	tars_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.