CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Cash flows from operating activities:
Net (loss) income	$ (86,431)	$ 10,963
Adjustments to reconcile net (loss) income to net cash used in operating activities:
Depreciation and amortization	7,048	5,630
Stock-based compensation	12,180	6,680
Amortization of operating lease ROU assets	45,627	37,646
(Gain) loss on foreign exchange	(2,311)	2,379
Capitalization of paid-in-kind interest on long-term debt	6,345	0
Amortization of debt issuance costs	2	8,750
Amortization of debt discounts	368	(3,007)
Change in fair value of share-settled redemption feature and gain on conversion of convertible notes	0	(29,512)
Change in fair value of SPAC Warrants	110	(14,895)
Change in fair value of Earn Out Liability	(1,498)	(73,177)	$ (30,322)
Other operating activities	622	682
Changes in:
Accounts receivable, net	(1,962)	3,233
Prepaid expenses	3,055	(9,408)
Other current and non-current assets	332	4,429
Accounts payable	(2,026)	(22,009)
Accrued liabilities	(2,060)	4,742
Taxes payable	2,020	2,963
Deferred revenue	16,703	15,253
Operating lease ROU assets and operating lease liabilities, net	(33,695)	(5,200)
Other current and non-current liabilities	79	3,165
Net cash used in operating activities	(35,492)	(50,693)
Cash flows from investing activities:
Purchase of property and equipment	(6,924)	(10,539)
Capitalization of internal-use software	(554)	(1,077)
Net cash used in investing activities	(7,478)	(11,616)
Cash flows from financing activities:
Proceeds from Delayed Draw Notes	0	159,225
Repayment of debt and payment of early termination fees	0	(27,745)
Proceeds from business combination and PIPE Investment	0	325,928
Common stock issuance costs	0	(58,555)
Proceeds from exercise of stock options	8	873
Net cash provided by financing activities	8	399,726
Effects of foreign exchange on cash	180	(327)
Net change in cash, cash equivalents, and restricted cash	(42,782)	337,090
Cash, cash equivalents, and restricted cash at beginning of period	289,186	69,941	69,941
Cash, cash equivalents, and restricted cash at end of period	246,404	407,031	289,186
Supplemental disclosure of cash flow information:
Cash paid for income taxes	0	381
Cash paid for interest	713	1,873
Supplemental disclosure of non-cash investing and financing activities
Accrued purchases of property and equipment	51	1,789
Conversion of Convertible Notes	0	159,172
Conversion of Legacy Sonder Warrants	0	1,243
Reclassification of liability-classified Legacy Sonder Warrants to equity	0	2,111
Recognition of Earn Out Liability	0	(98,117)	(98,117)
Recognition of SPAC Warrants	0	(25,985)
Issuance of Delayed Draw Warrants	0	5,598
Conversion of Exchangeable Stock	0	49,733
Conversion of Redeemable Convertible Preferred Stock	0	518,750
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	217,968	406,348	246,624
Restricted cash	28,436	683	42,562
Cash, cash equivalents, and restricted cash at end of period	$ 246,404	$ 407,031	$ 289,186