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Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands					1 Months Ended	12 Months Ended
	Dec. 07, 2020 USD ($) $ / shares shares	Oct. 06, 2020 USD ($) $ / shares shares	Oct. 01, 2020 shares	Jul. 22, 2020 USD ($) $ / shares shares	Sep. 30, 2020 shares	Dec. 31, 2020 USD ($) Employee $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Jul. 09, 2020 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares transferred from PDL to vested						6,000
Number of units vested						0
Total stock-based compensation expense \| $						$ 8,873	$ 818
Phantom Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Decrease in fair value \| $				$ 108
Shares authorized for grant						0	1,560,000
Number of units vested						6,000	71,000
Granted, Number of Units							6,000
Granted, Weighted-average grant-date fair value per share \| $ / shares							$ 10.80
Phantom Stock Plan \| Phantom Share Units (PSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield						0.00%	0.00%
Liabilities related to the PSU \| $						$ 0	$ 1,179
Fair value \| $ / shares							$ 14.94
Phantom Stock Plan \| Additional Paid-in Capital
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Reclassified fair value \| $				$ 306
2020 Incentive Award Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares authorized for grant								3,333,000
Description of share based payment award						The modified and newly granted restricted stock awards provide for vesting in quarterly installments over the three-year period following the modification date.
2020 Incentive Award Plan \| Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of units vested						96,000
Granted, Number of Units	305,000	4		1,847,000		2,174,000	0
Aggregate grant date fair value \| $	$ 2,201	$ 46		$ 19,951
Granted, Weighted-average grant-date fair value per share \| $ / shares	$ 7.22	$ 10.90		$ 10.80		$ 10.30
Vesting period following grant date	3 years
Restricted stock awards released			18,000
Percentage of number of shares of restricted stock award increase	20.00%
Total fair value of restricted stock awards vested \| $						$ 970	$ 0
Total unrecognized compensation expense \| $						$ 13,231
Total unrecognized compensation expense, weighted-average period of recognition						1 year 3 months 18 days
2020 Incentive Award Plan \| Restricted Stock \| Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period following proposed Spin-off				3 months
Vesting period following grant date				6 months
Vesting percentage		40.00%		40.00%
Vesting date		Jan. 22, 2021
2020 Incentive Award Plan \| Restricted Stock \| Tranche Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period following grant date				18 months
Vesting percentage		30.00%		30.00%
Vesting date		Jan. 22, 2022
2020 Incentive Award Plan \| Restricted Stock \| Tranche Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period following grant date				36 months
Vesting percentage		30.00%		30.00%
Vesting date		Jul. 22, 2023
2020 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Description of share based payment award						In September 2020, the Board of Directors approved the LENSAR Inc. 2020 Employee Stock Purchase Plan (the “2020 ESPP”), under which eligible employees are permitted to purchase common stock at a discount through payroll deductions. A total of 340 shares of common stock are reserved for issuance and will be increased on the first day of each fiscal year, beginning in 2022, by an amount equal to the lesser of (i) 1.0% of the outstanding shares of common stock as of the last day of the immediately preceding fiscal year; or (ii) a lesser amount as determined by the Board of Directors. The price of the common stock purchased will be the lower of 85% of the fair market value of the common stock at the beginning of an offering period or at the end of a purchase period.
Common stock reserved for issuance					340,000	340,000
Percentage of outstanding shares of common stock					1.00%
Percentage of fair market value of common stock					85.00%
Common stock issued to employees						0
PDL Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted, Number of Units						0
Total fair value of restricted stock awards vested \| $						$ 180	100
Total unrecognized compensation expense \| $						$ 0
Number of employee consisted of restricted stock award \| Employee						1
PDL Equity Incentive Plan \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period following grant date						1 year
PDL Equity Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period following grant date						2 years
PDL Equity Incentive Plan \| PDL Award
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense \| $						$ 153	$ 100
PDL 2005 Amended and Restated Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted, Weighted-average grant-date fair value per share \| $ / shares						$ 3.07	$ 3.46