Stock-based compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Mar. 11, 2021	Oct. 12, 2020	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 22, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares underlying outstanding options, options granted (in shares)				645,796	37,663,242	913,090
Options granted, weighted average grant date fair value (in dollars per share)				$ 5.90	$ 1.10	$ 4.39
Options assumed, weighted average grant date fair value (in dollars per share)				$ 3.11
Unamortized stock-based compensation expense of option				$ 26,400
Proceeds from exercise of stock options and purchase of shares				$ 500	$ 400	$ 100
Management and Employee
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Promissory notes, percentage forgiven			50.00%
Certain Executives
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Proceeds from noteholders debt			$ 500
Promissory Note | Notes Payable, Other Payables | Management and Employee
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Promissory notes		$ 1,100
Interest rate		0.38%
2021 Incentive Award Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Number of shares reserved for issuance (in shares)	18,558,576
Increase in number of shares authorized, annual increase percentage	5.00%
2015 Stock Plan | Management and Employee
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Vested options, exercised in period (in shares)		2,883,672
Unvested options, exercised in period (in shares)		4,603,833
Stock-based compensation, unvested shares outstanding (in shares)				1,501,976	6,212,254
Stock-based compensation, related liabilities				$ 300	$ 600
Stock-based compensation, number of options early exercised (in shares)				0	9,507,478
2015 Stock Plan | Certain Executives
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Compensation cost upon forgiveness of promissory notes				$ 500
Option
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Unamortized stock-based compensation expense, period for recognition				1 year 7 months 6 days
Option | Sense Photonics Inc.
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation arrangement, number of shares assumed in business combination							823,114
Option | 2021 Incentive Award Plan | Share-based Payment Arrangement, Monthly Vesting for Thirty Six Month
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage	2.78%
Option | 2021 Incentive Award Plan | One Senior Advisor
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period			5 years
Number of shares underlying outstanding options, options granted (in shares)			1,614,492
Common stock price to option exercise price, threshold percentage				130.00%
Threshold number of consecutive trading days			30 days
Option | 2021 Incentive Award Plan | One Senior Advisor | Share-based Payment Arrangement, Tranche One
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage			20.00%
Option | 2021 Incentive Award Plan | One Senior Advisor | Share-based Payment Arrangement, Tranche Two
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage			20.00%
Option | 2021 Incentive Award Plan | One Senior Advisor | Share-based Payment Arrangement, Tranche Three
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage			20.00%
Option | 2021 Incentive Award Plan | One Senior Advisor | Share-based Payment Arrangement, Tranche Five
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage			20.00%
Option | 2021 Incentive Award Plan | One Senior Advisor | Share-based Payment Arrangement, Tranche Four
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage			20.00%
Option | 2015 Stock Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Minimum exercise price as percentage of fair value of shares on grant date				100.00%
Award vesting period				4 years
Option | 2015 Stock Plan | A Shareholder with 10% Ownership
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Option expiration period				5 years
Minimum exercise price as percentage of fair value of shares on grant date				110.00%
Shareholder ownership percentage				10.00%
Option | 2015 Stock Plan | Maximum
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Option expiration period				10 years
Restricted Stock Award
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock granted in period, other than options (in shares)				0	1,617,264
RSAs vested in period, fair value (less than)				$ 100	$ 1,100	$ 100
Restricted Stock Award | 2021 Incentive Award Plan | Employee
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period				4 years
Restricted Stock Award | 2015 Stock Plan | Employee
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting rights, vested percentage				100.00%
Restricted Stock Award | 2015 Stock Plan | Employee | Share-based Payment Arrangement, Tranche One
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage				25.00%
Restricted stock units
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period				3 years 6 months
Stock granted in period, other than options (in shares)				5,224,504
RSU, cost not yet recognized				$ 61,000
Restricted stock units | Sense Photonics Inc.
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation arrangement, number of shares assumed in business combination							4,490,980
Restricted stock units | 2021 Incentive Award Plan | Employee
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period				4 years
Award vesting rights, vested percentage				100.00%
Restricted stock units | 2021 Incentive Award Plan | One Senior Advisor
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period			5 years
Stock granted in period, other than options (in shares)			807,246
Restricted stock units | 2021 Incentive Award Plan | One Senior Advisor | Share-based Payment Arrangement, Tranche One
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage			20.00%
Restricted stock units | 2021 Incentive Award Plan | One Senior Advisor | Share-based Payment Arrangement, Tranche Two
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage			20.00%
Restricted stock units | 2021 Incentive Award Plan | One Senior Advisor | Share-based Payment Arrangement, Tranche Three
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage			20.00%
Restricted stock units | 2021 Incentive Award Plan | One Senior Advisor | Share-based Payment Arrangement, Tranche Five
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage			20.00%
Restricted stock units | 2021 Incentive Award Plan | One Senior Advisor | Share-based Payment Arrangement, Tranche Four
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage			20.00%
Restricted stock units | 2021 Incentive Award Plan | Several Members of the Board of Directors
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock granted in period, other than options (in shares)			152,628
Restricted stock units | 2015 Stock Plan | Employee | Share-based Payment Arrangement, Tranche One
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting schedule in percentage				25.00%
Performance Stock Unit | 2021 Incentive Award Plan | One Senior Advisor
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Award vesting period			4 years
Stock granted in period, other than options (in shares)			807,246
Percentage of performance stock units			25.00%
Number of common stock received upon vesting of each performance stock unit (in shares)			1
Performance Stock Unit | 2021 Incentive Award Plan | Minimum | One Senior Advisor
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Performance stock, stock price increase percentage			150.00%
Performance Stock Unit | 2021 Incentive Award Plan | Maximum | One Senior Advisor
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Performance stock, stock price increase percentage			300.00%