Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 1,157,348	$ 42,440
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	63,688	99,403
Non-cash reduction to the right-of-use asset	9,484	10,516
Net amortization of investment premium and discount	(4,093)	(8,182)
Stock-based compensation	278,423	288,524
Amortization of deferred commissions	33,556	38,387
Provision for doubtful accounts	10,763	3,686
Value of shares of Class A common stock issued and donated to charity	6,801	5,013
Share of losses from equity method investment	51,569	44,693
Tax benefit related to release of valuation allowance	(944,097)	0
Impairment loss on prepaid assets	32,771	0
Other adjustments	4,367	3,487
Changes in operating assets and liabilities:
Accounts receivable	(133,652)	(3,112)
Prepaid expenses and other current assets	101,533	84,662
Deferred tax asset	(49,412)	(1,732)
Other long-term assets	(551)	(49,688)
Accounts payable	(14,462)	(24,323)
Accrued expenses and other current liabilities	(52,851)	(40,086)
Deferred revenue and customer deposits	(5,674)	(7,671)
Operating lease liabilities	(17,768)	(18,693)
Other long-term liabilities	(2,152)	802
Net cash provided by operating activities	525,591	468,126
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisitions, net of cash acquired and payments related to prior period acquisitions	(685)	0
Purchases of marketable securities and other investments	(491,492)	(408,836)
Proceeds from sales and maturities of marketable securities and other investments	438,342	818,034
Capitalized software development costs	(33,383)	(24,152)
Purchases of long-lived assets	(7,218)	(2,167)
Net cash (used in) provided by investing activities	(94,436)	382,879
CASH FLOWS FROM FINANCING ACTIVITIES:
Principal payments on finance leases	(128)	(4,228)
Value of equity awards withheld for tax liabilities	(43)	(138)
Repurchases of shares of Class A common stock and related costs	(323,048)	(323,249)
Proceeds from exercises of stock options and shares of Class A common stock issued under ESPP	32,791	25,907
Net cash used in financing activities	(290,428)	(301,708)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	140,727	549,297
CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period	682,534	431,437
CASH, CASH EQUIVALENTS AND RESTRICTED CASH —End of period	823,261	980,734
Cash paid for income taxes, net	23,519	13,088
Cash paid for interest	18,762	18,813
RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH TO THE CONDENSED CONSOLIDATED BALANCE SHEETS
Cash and cash equivalents	823,261	969,229
Restricted cash in other long-term assets	0	11,505
Total cash, cash equivalents and restricted cash	$ 823,261	$ 980,734

Common Stock, Donor Advised Fund, Value

No definition available.

Name:	twlo_CommonStockDonorAdvisedFundValue
Namespace Prefix:	twlo_
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.