Debt - Additional Information (Detail)										1 Months Ended					9 Months Ended	12 Months Ended
	Nov. 18, 2021 USD ($)	Aug. 12, 2020 USD ($)	May 22, 2020 USD ($)	Apr. 13, 2020 USD ($)	Oct. 28, 2019 USD ($)	May 07, 2019 USD ($) shares	May 07, 2019 USD ($) shares	Nov. 09, 2018 USD ($) $ / shares shares	Nov. 09, 2018 USD ($) d $ / shares shares	Apr. 30, 2021	Jul. 31, 2020 USD ($)	Mar. 31, 2020 USD ($) $ / shares shares	Nov. 30, 2019 $ / shares	Oct. 31, 2019 $ / shares	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Feb. 24, 2021 USD ($)	Feb. 10, 2021 $ / shares	Jun. 10, 2020 $ / shares	May 15, 2020 USD ($)	Apr. 14, 2020 USD ($)	Oct. 29, 2019 $ / shares	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Change in fair value of warrants																$ 0	$ (5,850,000)
Non current term loans																13,603,000	16,186,000
Borrowings under lines of credit																0	3,000,000
Repayments of lines of credit																0	3,000,000
Debt issuance costs																$ 25,000	128,000		133,000
Weighted-average interest rate																12.00%
EBITDA target																$ (16,431,000)	(18,536,000)		(15,621,000)
Share price | $ / shares														$ 0.5750								$ 1.03
Public Offering
Debt Instrument [Line Items]
Share price | $ / shares																										$ 0.5750
Common Stock
Debt Instrument [Line Items]
Initial exercise price of warrants | $ / shares																							$ 0.515
SWK Warrants
Debt Instrument [Line Items]
Warrants expiration period									8 years
Warrants fair value assumptions, expected volatility rate									81.79%
Warrants fair value assumptions annual dividend per share | $ / shares								$ 0.00	$ 0.00
Warrants fair value assumptions, risk-free interest rate									3.13%
Change in fair value of warrants									$ 400
Warrants issued to purchase shares of common stock | shares								372,023	372,023			487,198
Warrants expire date									Nov. 09, 2026
Initial exercise price of warrants | $ / shares								$ 1.34	$ 1.34			$ 0.39
Warrants adjusted strike price | $ / shares												$ 0.49	$ 1.00	$ 1.00
Number of trading days of average closing price of common stock | d									10
Additional Class Of Warrant Or Right Number Of Securities Called By Warrants Or Rights | shares												63,779
DPG Warrants
Debt Instrument [Line Items]
Finder's fee									$ 500,000
Credit Agreement First Amendment
Debt Instrument [Line Items]
Additional warrants to purchase common stock value							$ 100,000
Additional finders fee							100,000
Credit Agreement First Amendment | SWK Warrants
Debt Instrument [Line Items]
Additional warrants to purchase common stock value							$ 200,000
Business Financing Agreement
Debt Instrument [Line Items]
Non current term loans																	2,980,000
Loan forgiveness description of period																The review may include the loan forgiveness application, as well as whether the Company received the proper loan amount. There can be no assurance as to the result of any such SBA review
Period For Review Of Forgiveness Of Loan																6 years
Business Financing Agreement
Debt Instrument [Line Items]
Note interest rate per annum			3.75%
Non current term loans																$ 150,000	150,000
Loan principal amount			$ 150,000
Loan periodic payment terms			installment payments, including principal and interest, are due monthly beginning in July 2021 and are payable through July 2050. In April 2021, the SBA announced that it was extending the first payment due date for all loans until 2022, or 24 months from the loan execution date. The Company is obligated to begin making payments on this EIDL Loan starting in May 2022. Fixed payments are first applied to any accrued interest.
Extension of loan due date										2022
Loan balance payment terms			payable through July 2050
Maximum | SWK Warrants
Debt Instrument [Line Items]
Change in fair value of warrants												$ 100,000
Warrants issued to purchase shares of common stock | shares								372,023,000	372,023,000
Initial exercise price of warrants | $ / shares																$ 0.88
Maximum | DPG Warrants
Debt Instrument [Line Items]
Warrants issued to purchase shares of common stock | shares								279,851,000	279,851,000
Maximum | BIOLASE Warrants Member
Debt Instrument [Line Items]
Warrants issued to purchase shares of common stock | shares						34,552,000	34,552,000
Maximum | Business Financing Agreement
Debt Instrument [Line Items]
Nonpayroll costs eligible for loan forgiveness percentage											40.00%
Minimum | SWK Warrants
Debt Instrument [Line Items]
Initial exercise price of warrants | $ / shares																$ 1.34
Minimum | Business Financing Agreement
Debt Instrument [Line Items]
Nonpayroll costs eligible for loan forgiveness percentage											25.00%
Pacific Mercantile Bank | Credit Agreement First Amendment
Debt Instrument [Line Items]
Proceeds from issuance of equity securities											$ 8,000,000.0
Company maintains unrestricted cash											$ 1,500,000
Pacific Mercantile Bank | Business Financing Agreement
Debt Instrument [Line Items]
Loan granted amount from bank																									$ 2,980,000
Note issued date				Apr. 13, 2020
Note maturity date				Apr. 13, 2022
Note interest rate per annum				1.00%
Note payable commencing date				Nov. 01, 2020
Non current term loans				$ 3,000,000.0
Western Alliance | Business Financing Agreement
Debt Instrument [Line Items]
Repayments of lines of credit								$ 900,000
SWK Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity																											$ 12,500,000
Non current term loans																$ 14,300,000	14,300,000
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 (A) no less than $1.5 million or (B) 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																				$ 1,000,000.0
Interest expense																$ 1,700,000	1,800,000		$ 2,200,000
Incremental amendment fee																25,000
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								plus 10% or another index that approximates LIBOR as close as possible if and when LIBOR no longer exists.
SWK Loan | Credit Agreement First Amendment
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 15,000,000.0	$ 15,000,000.0
Debt instrument covenant description																			(i) adjust minimum revenue and EBITDA levels, (ii) require the Company to have a shelf registration statement declared effective by the Securities and Exchange Commission 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 September 30, 2019, and (iii) require minimum liquidity of $1.5 million at all times. The First Amendment provided that if aggregate minimum revenue and EBITDA levels were not achieved by September 30, 2019, the minimum liquidity requirement would 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	1,500,000
Additional equity or debt funding requirement until minimum liquidity is met						5,000,000.0	5,000,000.0
Maximum aggregate offering price						10,000,000.0
Increase in minimum liquidity requirement if aggregate minimum revenue and EBITDA levels are not achieved						3,000,000.0	3,000,000.0
Financial covenant additional borrowings						2,500,000	2,500,000
Loan origination and other fees to be paid						$ 100,000	$ 100,000
SWK Loan | Credit Agreement, Second Amendment [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity															$ 5,000,000
Gross proceeds from subordinated debt threshold limit															$ 5,000,000
SWK Loan | Credit Agreement, Sixth Amendment
Debt Instrument [Line Items]
Repayments of lines of credit		$ 700,000
SWK Loan | Credit Agreement Eighth Amendment
Debt Instrument [Line Items]
Note maturity date	May 31, 2025
Debt Instrument, Interest Rate, Basis Point	200 basis points
SWK Loan | Maximum
Debt Instrument [Line Items]
Debt instrument covenants unencumbered liquid assets								$ 1,500,000	$ 1,500,000
SWK Loan | Maximum | Credit Agreement, Fifth Amendment
Debt Instrument [Line Items]
Subordinated debt issued																		$ 10,000,000.0
SWK Loan | Maximum | Credit Agreement, Seventh Amendment
Debt Instrument [Line Items]
Debt instrument covenants unencumbered liquid assets																					$ 15,000,000
SWK Loan | Maximum | Credit Agreement Eighth Amendment
Debt Instrument [Line Items]
Debt instrument covenants unencumbered liquid assets	$ 7,500,000
SWK Loan | Minimum | Credit Agreement, Fifth Amendment
Debt Instrument [Line Items]
Debt instrument covenants unencumbered liquid assets																		3,000,000.0						$ 1,500,000
Revenue target																		41,000,000.0
EBITDA target																		$ 7,000,000.0
SWK Loan | Minimum | Credit Agreement, Seventh Amendment
Debt Instrument [Line Items]
Debt instrument covenants unencumbered liquid assets																					$ 15,000,000
Loan Agreement | Pacific Mercantile Bank
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity					$ 3,000,000
Maximum borrowing base percentage of eligible accounts					90.00%
Maximum borrowing base percentage of eligible inventory					75.00%
Line of credit facility expiration date					Oct. 28, 2021
Interest rate					1.50%
Line of credit, outstanding borrowings																$ 0	$ 0
Loan Agreement | Pacific Mercantile Bank | Minimum
Debt Instrument [Line Items]
Interest rate					6.00%
Loan Agreement | Exim Bank
Debt Instrument [Line Items]
Initial and annual fee					$ 52,500