Description of Organization, Business Operations and Basis of Presentation (Details) - USD ($)				5 Months Ended	9 Months Ended
	Oct. 14, 2020	Sep. 15, 2020	May 19, 2020	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Subsidiary, Sale of Stock [Line Items]
Offering cost				$ 5,923,016
Deferred underwriting commissions					$ 10,685,605	$ 10,685,605
Per share value of residual assets in trust account					$ 10.00
Cash					$ 700,000
Working capital deficit					$ (2,000,000.0)
Condition For Future Business Combination Number Of Businesses Minimum					one
Duration Of Combination Period					24 months
Working Capital Loans
Subsidiary, Sale of Stock [Line Items]
Price of warrants (in dollars per share)			$ 1.00
Outstanding balance of related party note					$ 0
Class A ordinary shares
Subsidiary, Sale of Stock [Line Items]
Common stock, par value					$ 0.0001	$ 0.0001
Class B ordinary shares
Subsidiary, Sale of Stock [Line Items]
Common stock, par value					0.0001	$ 0.0001
Initial Public Offering, the Over-Allotment and the Private Placement
Subsidiary, Sale of Stock [Line Items]
Share price					$ 10.00
Gross proceeds					$ 305,300,000
Percentage of aggregate fair market value of assets					80.00%
Ownership interest to be acquired on post-transaction company					50.00%
Maturity term of U.S. government securities					185 days
IPO
Subsidiary, Sale of Stock [Line Items]
Number of shares issued		30,000,000
Share price		$ 10.00			$ 10.00
Gross proceeds	$ 5,300,000	$ 300,000,000.0
Offering cost	292,000	16,600,000
Deferred underwriting commissions	186,000	$ 10,500,000
Minimum net tangible assets upon consummation of business combination					$ 5,000,001
Maximum percentage of shares that can be redeemed without prior consent of the Company					15.00%
Percentage of shares of stock the Company is obligated to redeem without consummating a business combination					100.00%
Threshold trading days to redeem the shares					10 days
Interest to pay dissolution expenses					$ 100,000
IPO \| Class A ordinary shares
Subsidiary, Sale of Stock [Line Items]
Exercise price of warrants (in dollars per share)					$ 11.50
Common stock, par value					$ 0.0001
Number of Warrants Issued Per Unit					0.5
Over-allotment option
Subsidiary, Sale of Stock [Line Items]
Number of shares issued		4,500,000			4,500,000
Gross proceeds	5,300,000
Offering cost	292,000
Deferred underwriting commissions	$ 186,000
Underwriting option period					45 days
Over-allotment option \| Class B ordinary shares
Subsidiary, Sale of Stock [Line Items]
Number of shares agreed to issue	530,301
Private Placement
Subsidiary, Sale of Stock [Line Items]
Proceeds from issuance of warrants	$ 106,060		$ 8,000,000.0
Number of warrants to purchase the shares issued (in shares)	106,060		8,000,000
Price of warrants (in dollars per share)			$ 1.00
Private Placement \| Class A ordinary shares
Subsidiary, Sale of Stock [Line Items]
Exercise price of warrants (in dollars per share)			$ 11.50

Broadstone Acquisition Corp. 10-Q/A