BIOLASE, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Detail)

Debt - Additional Information (Detail)					3 Months Ended	9 Months Ended
Debt - Additional Information (Detail)	May 07, 2019 USD ($) Day $ / shares shares	Nov. 09, 2018 USD ($) Day $ / shares shares	Sep. 27, 2018 USD ($) $ / shares shares	Mar. 06, 2018 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)	Oct. 22, 2018 USD ($)	Aug. 13, 2018 USD ($)
Debt Instrument [Line Items]
Borrowings under lines of credit							$ 3,323,000
Repayments of lines of credit							1,823,000
Debt issuance costs						$ 38,000	$ 87,000
SWK Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000							$ 12,500,000
Line of credit facility term		5 years
Borrowings under lines of credit		$ 12,500,000
Debt instrument, repayment of interest-only on loan period		2 years
Debt instrument, principal repayments beginning term		2021
Repayments of lines of credit		$ 700,000
Debt instrument, maturity term		2023
Debt instrument covenant description						(i) maintain unencumbered liquid assets of no less than $1.5 million or the sum of aggregate cash flow from operations less capital expenditures, (ii) achieve certain revenue and EBITDA levels during the first two years of the loan, (iii) limit future borrowing, investments and dividends, and (iv) submit monthly and quarterly financial reporting.
Debt issuance costs		$ 1,000,000
Loan origination fee		200,000
Finder's fee		400,000
Legal and other fees		$ 400,000
Interest expense					$ 600,000	$ 1,600,000
Weighted-average interest rate					12.70%	12.70%
SWK Loan \| LIBOR
Debt Instrument [Line Items]
Line of credit facility bearing floating interest rate per annum		10.00%
Line of credit facility interest rate description						London Interbank Bank Offered Rate (“LIBOR”) plus 10% or another index that approximates LIBOR as close as possible if and when LIBOR no longer exists.
Western Alliance Warrant
Debt Instrument [Line Items]
Warrants issued to purchase shares of common stock \| shares			56,338
Warrants expire date			Sep. 27, 2028
Initial exercise price of warrants \| $ / shares			$ 2.13
SWK Warrants
Debt Instrument [Line Items]
Warrants expiration period	8 years	8 years
Warrants fair value assumptions, expected volatility rate	80.73%	81.79%
Warrants fair value assumptions annual dividend per share \| $ / shares	$ 0.00	$ 0.00
Warrants fair value assumptions, risk-free interest rate	2.37%	3.13%
Warrants, estimated fair value	$ 200,000	$ 400,000
Warrants issued to purchase shares of common stock \| shares	115,175	372,023
Initial exercise price of warrants \| $ / shares	$ 2.17	$ 1.34
Warrants expiration period	7 years	7 years
Number of trading days of average closing price of common stock \| Day	10	10
DPG Warrants
Debt Instrument [Line Items]
Warrants expiration period	8 years	8 years
Warrants fair value assumptions, expected volatility rate	80.73%	81.79%
Warrants fair value assumptions annual dividend per share \| $ / shares	$ 0.00	$ 0.00
Warrants fair value assumptions, risk-free interest rate	2.37%	3.13%
Warrants, estimated fair value	$ 100,000	$ 300,000
Warrants issued to purchase shares of common stock \| shares	34,552	279,851
Initial exercise price of warrants \| $ / shares	$ 2.17	$ 1.34
Finder's fee						$ 500,000
Warrants expiration period	7 years	7 years
Number of trading days of average closing price of common stock \| Day	10	10
SWK Warrants and DPG Warrants
Debt Instrument [Line Items]
Warrants effective-interest method amortization period						5 years
Maximum \| SWK Loan
Debt Instrument [Line Items]
Debt instrument covenants unencumbered liquid assets		$ 1,500,000
Business Financing Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 6,000,000
Line of credit facility expiration date				Mar. 06, 2020
Line of credit facility, interest rate description						Amounts outstanding under the Business Financing Agreement bore interest at a per annum floating rate equal to the greater of 4.5% or the “Prime Rate” published in the Money Rates section of the Western Edition of The Wall Street Journal (or such other rate of interest publicly announced from time to time by Western Alliance as its “Prime Rate”), plus 1.5% with respect to advances made under the line of credit, plus an additional 5.0% during any period that an event of default occurred and was continuing.
Line of credit facility, commitment fee amount				$ 67,500
Line of credit facility, commitment fee description						the Company paid the first of two annual commitment fees totaling $67,500, being 0.25% of the aggregate $6.0 million commitment for the Domestic Revolver and 1.75% of the aggregate $3.0 million commitment for the EXIM Revolver. The commitment fees and the legal costs associated with acquiring the credit facilities were capitalized and were amortized on a straight-line basis as interest expense over the term of the Business Financing Agreement
Business Financing Agreement \| Western Alliance
Debt Instrument [Line Items]
Line of credit facility minimum unrestricted cash covenant									$ 300,000
Interest expense including debt issuance costs		100,000
Repayments of lines of credit		$ 900,000
Business Financing Agreement \| Western Alliance Warrant
Debt Instrument [Line Items]
Warrants expiration period				10 years
Warrants fair value assumptions, expected volatility rate				91.49%
Warrants fair value assumptions annual dividend per share \| $ / shares				$ 0.00
Warrants fair value assumptions, risk-free interest rate				2.88%
Warrants, estimated fair value				$ 100,000
Business Financing Agreement \| Domestic Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 6,000,000
Maximum borrowing base percentage of eligible accounts receivable				75.00%
Line of credit facility commitment fee percentage				0.25%
Line of credit facility, commitment fee amount				$ 6,000,000
Business Financing Agreement \| Export Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 3,000,000
Maximum borrowing base percentage of eligible accounts receivable				85.00%
Line of credit facility commitment fee percentage				1.75%
Line of credit facility, commitment fee amount				$ 3,000,000
Business Financing Agreement \| Line of Credit
Debt Instrument [Line Items]
Variable interest Rate with respect to advances made				1.50%
Line of credit facility interest rate during period in event of default				5.00%
Business Financing Agreement \| Line of Credit \| Minimum
Debt Instrument [Line Items]
Line of credit facility bearing floating interest rate per annum				4.50%
Business Financing Modification Agreement \| Western Alliance
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity			$ 2,500,000
Line of credit facility expiration date			Mar. 06, 2019
Line of credit facility default covenant advance										$ 1,500,000
Line of credit, outstanding borrowings			$ 1,500,000
Credit Agreement, First Amendment [Member] \| SWK Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 15,000,000
Debt instrument covenant description						(a) adjust minimum revenue and EBITDA levels, (b) require the Company to have a shelf registration statement declared effective by the SEC before September 30, 2019, with a proposed maximum aggregate offering price of at least $10.0 million if the Company does not reach set minimum revenue levels for the three-month period ended June 30, 2019, and (c) require minimum liquidity of $1.5 million at all times. The First Amendment provides that if aggregate minimum revenue and EBITDA levels are not achieved by September 30, 2019, the minimum liquidity requirement will be increased to $3.0 million, until the Company has obtained additional equity or debt funding of no less than $5.0 million.
Minimum level of liquidity financial covenant	1,500,000
Additional equity or debt funding requirement until minimum liquidity is met	5,000,000
Maximum aggregate offering price	10,000,000
Increase in minimum liquidity requirement if aggregate minimum revenue and EBITDA levels are not achieved	3,000,000
Loan origination and other fees to be paid	100,000
Credit Agreement, First Amendment [Member] \| SWK Warrants
Debt Instrument [Line Items]
Additional warrants to purchase common stock value	200,000
Credit Agreement, First Amendment [Member] \| DPG Warrants
Debt Instrument [Line Items]
Additional warrants to purchase common stock value	100,000
Additional finders fee	$ 100,000
Credit Agreement, Second Amendment [Member] \| SWK Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 5,000,000	$ 5,000,000
Credit Agreement, Second Amendment [Member] \| Minimum \| SWK Loan
Debt Instrument [Line Items]
Gross proceeds from subordinated debt threshold limit						$ 5,000,000