CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (10,445)	$ (10,214)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	691	1,258
Depreciation and amortization	91	95
Loss on disposal of fixed assets	0	3
Loss from equity method investment	100	0
Amortization/accretion on marketable securities	(285)	(426)
Changes in operating assets and liabilities:
Prepaid and other current assets	(352)	(1,161)
Other assets	83	117
Accounts payable, accrued liabilities and other liabilities	(2,193)	(2,052)
Net cash used in operating activities	(12,310)	(12,380)
Cash flows from investing activities:
Purchase of marketable securities	(28,515)	(60,836)
Sale of marketable securities	46,764	64,400
Investment in Impilo Therapeutics	(100)	0
Net cash provided by investing activities	18,149	3,564
Cash flows from financing activities:
Proceeds from exercise of options	0	155
Tax withholding payments on net share settlement equity awards	(142)	(85)
Net proceeds from issuance of common stock	32	297
Net cash (used in) provided by financing activities	(110)	367
Effect of exchange rate changes on cash	(29)	(15)
Net increase (decrease) in cash and cash equivalents	5,700	(8,464)
Cash and cash equivalents at beginning of period	22,593	32,154
Cash and cash equivalents at end of period	$ 28,293	$ 23,690

Increase Decrease In Accounts Payable Accrued Expenses And Other Liabilities

No definition available.

Name:	lsta_IncreaseDecreaseInAccountsPayableAccruedExpensesAndOtherLiabilities
Namespace Prefix:	lsta_
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.