Business Combination - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Jan. 18, 2022 USD ($) $ / shares shares	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Jan. 17, 2022 $ / shares	Jan. 14, 2022
Business Acquisition [Line Items]
Increase in cash from business combination | $		$ 401,918
Repayment of debt | $		24,680	$ 2,018
Nonrecurring transaction costs | $		58,555
Proceeds from delayed draw notes | $		$ 159,225	$ 0
Existing PIPE Investment holders
Business Acquisition [Line Items]
Number of shares issued (in shares) | shares	20,000,000
Purchase price of stock (in dollars per share) | $ / shares	$ 10.00
Aggregate purchase price | $	$ 200,000
New PIPE Investment Holders
Business Acquisition [Line Items]
Number of shares issued (in shares) | shares	11,507,074
Purchase price of stock (in dollars per share) | $ / shares	$ 8.89
Aggregate purchase price | $	$ 102,300
Gores Metropoulos Sponsor II, LLC
Business Acquisition [Line Items]
Number of shares issued (in shares) | shares	709,711
Purchase price of stock (in dollars per share) | $ / shares	$ 10.00
Aggregate purchase price | $	$ 7,100
Common Stock
Business Acquisition [Line Items]
Number of shares issued in transaction (in shares) | shares	190,160,300
Common stock par value (in dollars per share) | $ / shares	$ 0.0001
Aggregate number of contingently issuable shares (in shares) | shares	14,500,000
Unrecognized stock-based compensation | $	$ 5,500
Common Stock | Legacy Sonder Common Stockholders
Business Acquisition [Line Items]
Number of shares issued in transaction (in shares) | shares	140,544,052
Exchange rate	1.4686
Common Stock | Legacy Sonder Stock Option Holders
Business Acquisition [Line Items]
Number of shares issued in transaction (in shares) | shares	30,535,549
Exchange rate	1.5444
Special Voting Series AA Common Stock
Business Acquisition [Line Items]
Common stock par value (in dollars per share) | $ / shares	$ 0.0001
Special Voting Series AA Common Stock | Legacy Sonder Special Voting Common Stockholders
Business Acquisition [Line Items]
Number of shares issued in transaction (in shares) | shares	32,296,539
Exchange rate					1.4686
Legacy Sonder | Common Stock
Business Acquisition [Line Items]
Common stock par value (in dollars per share) | $ / shares				$ 0.000001
Legacy Sonder | Special Voting Series AA Common Stock
Business Acquisition [Line Items]
Common stock par value (in dollars per share) | $ / shares	$ 0.000001
Sunshine Merger Sub I, LLC | Sunshine Merger Sub II, LLC
Business Acquisition [Line Items]
Percentage of outstanding stock owned	100.00%
Sunshine Merger Sub II, LLC
Business Acquisition [Line Items]
Percentage of outstanding stock owned	100.00%
Legacy Sonder
Business Acquisition [Line Items]
Percentage of outstanding stock owned	79.70%