Stock-Based Compensation - Summary of Unrecognized Compensation Expense Expected To Be Amortized (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Unrecognized stock-based compensation expense expected to be amortized, 2021	$ 5,733
Unrecognized stock-based compensation expense expected to be amortized, 2022	4,701
Unrecognized stock-based compensation expense expected to be amortized, 2023	$ 2,797

Employee service share based compensation non vested awards total compensation cost not yet recognized share based awards other than options future amortization next twelve months.

No definition available.

Name:	lnsr_EmployeeServiceShareBasedCompensationNonVestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptionsFutureAmortizationNextTwelveMonths
Namespace Prefix:	lnsr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant