BIOLASE, Inc. Annual report pursuant to Section 13 and 15(d)

Subsequent Events - Additional Information (Detail) - USD ($)				1 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 25, 2021	Feb. 10, 2021	Jan. 01, 2021	Feb. 28, 2021	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Feb. 24, 2021	Dec. 31, 2019	Oct. 31, 2019	Nov. 09, 2018
Subsequent Event [Line Items]
Proceeds from the exercise of common stock warrants							$ 46,000
Shares issued							97,708,502		31,439,000
Shares issued price per share										$ 0.5750
Equity raise of gross proceeds				$ 14,400,000	$ 24,000,000	$ 24,000,000
SWK Loan \| Maximum
Subsequent Event [Line Items]
Debt instrument covenants unencumbered liquid assets											$ 1,500,000
Subsequent Event
Subsequent Event [Line Items]
Common stock issued from exercise of warrants	35,460,000
Proceeds from the exercise of common stock warrants			$ 15,000,000
Shares issued		14,000,000
Shares issued price per share		$ 1.03
Equity raise of gross proceeds		$ 14,400,000
Subsequent Event \| Credit Agreement, Seventh Amendment \| SWK Loan \| Maximum
Subsequent Event [Line Items]
Debt instrument covenants unencumbered liquid assets								$ 15,000,000
Subsequent Event \| July 2020 Warrants
Subsequent Event [Line Items]
Proceeds from the exercise of common stock warrants	$ 11,200,000
Subsequent Event \| June 2020 Warrants
Subsequent Event [Line Items]
Proceeds from the exercise of common stock warrants	$ 3,800,000