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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following is a summary of assets and liabilities measured at fair value on a recurring basis (in thousands):

									December 31,
									2021																								2020
																											Level 1						Level 2						Level 3						Total						Level 1						Level 2						Level 3						Total
Cash and cash equivalents:
Cash																											$	13,621					$	—					$	—					$	13,621					$	1,502					$	—					$	—					$	1,502
Cash equivalents																											290,699						—						—						290,699						98,628						—						—						98,628
Total cash and cash equivalents																											$	304,320					$	—					$	—					$	304,320					$	100,130					$	—					$	—					$	100,130
Preferred stock warrant liability																											$	—					$	—					$	—					$	—					$	—					$	—					$	177					$	177
Loan facility derivative liability																											$	—					$	—					$	1,496					$	1,496					$	—					$	—					$	1,782					$	1,782

Redeemable Convertible Preferred Stock Warrants

The following table sets forth a summary of the changes in the estimated fair value of the Company’s redeemable convertible preferred stock warrants, which represents financial instruments with valuations classified as Level 3. When a determination is made to classify a financial instrument within Level 3, the determination is based upon the significance of the unobservable inputs to the overall fair value measurement. However, Level 3 financial instruments typically include, in addition to the unobservable inputs, observable inputs (that is, components that are actively quoted and can be validated to external sources). Accordingly, the gain or loss in the table below includes changes in fair value due in part to observable factors that are part of the Level 3 methodology recognized in the statement of operations as a component of interest and other income or expense as appropriate (in thousands):

									Year Ended December 31,
									2021						2020
Beginning of the period									$	177					$	870
Exercised									(113)						(508)
Cancelled									(16)						—
Change in fair value									(48)						(185)
End of the period									$	—					$	177

Warrants to purchase shares of redeemable convertible preferred stock outstanding and exercisable are as follows (in thousands, except per share data):

Dates																								Exercise Price												Shares Outstanding at December 31,												Initial Value												Fair Value at December 31,
Issuance						Expiration												Series																		2021						2020																		2021						2020
June 2017						June 2022												E						13.73												—						72						763												$	—					$	177

Schedule of Valuation Assumptions

The fair value of the redeemable convertible preferred stock warrant liability was determined using the Black-Scholes option pricing model using the following assumptions:

												Year Ended December 31,
															2020
Expected life (years)															1.7
Expected volatility															68		%
Risk-free interest rate															0.1		%
Expected dividend rate															—		%

Schedule of Derivative Liabilities at Fair Value

The following table sets forth a summary of the changes in the estimated fair value of the Company’s loan facility derivative liability, classified as Level 3 (in thousands):

									Year Ended December 31,
									2021						2020
Beginning of the period									$	1,782					$	1,482
Issued									—						—
Payment of success fee									(150)						—
Change in fair value									$	(136)					$	300
End of the period									$	1,496					$	1,782

Revenue from External Customers by Products and Services

The following table presents revenue disaggregated by type and geography (in thousands):

									Year Ended December 31,
									2021						2020
U.S.
System sales and rentals									$	19,375					$	2,334
Handpieces and other consumables									8,893						1,699
Service									680						67
Total U.S. revenue									28,948						4,100
Outside of U.S.
System sales and rentals									2,493						1,824
Handpieces and other consumables									2,634						1,722
Service									398						71
Total outside of U.S. revenue									5,525						3,617
Total revenue									$	34,473					$	7,717

Schedule of Earnings Per Share, Basic

Net loss per share was determined as follows (in thousands, except per share amounts):

									Year Ended December 31,
									2021						2020
Net loss									$	(59,853)					$	(53,019)
Weighted-average common stock outstanding									16,480						3,663
Net loss per share, basic and diluted									$	(3.63)					$	(14.47)

Schedule of Earnings Per Share, Diluted

Net loss per share was determined as follows (in thousands, except per share amounts):

									Year Ended December 31,
									2021						2020
Net loss									$	(59,853)					$	(53,019)
Weighted-average common stock outstanding									16,480						3,663
Net loss per share, basic and diluted									$	(3.63)					$	(14.47)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following potentially dilutive securities outstanding have been excluded from the computations of weighted-average shares outstanding because such securities have an antidilutive impact due to losses reported (in common stock equivalent shares, in thousands):

															December 31,
									2021						2020
Redeemable convertible preferred stock outstanding									—						25,402
Redeemable convertible preferred stock warrants									—						72
Common stock warrants									—						—
Common stock options									6,365						6,507
Restricted stock units									35						—
Employee stock purchase plan									193						—
Total									6,593						31,981

Revenue from External Customers by Geographic Areas

The following table presents revenue disaggregated by type and geography (in thousands):

									Year Ended December 31,
									2021						2020
U.S.
System sales and rentals									$	19,375					$	2,334
Handpieces and other consumables									8,893						1,699
Service									680						67
Total U.S. revenue									28,948						4,100
Outside of U.S.
System sales and rentals									2,493						1,824
Handpieces and other consumables									2,634						1,722
Service									398						71
Total outside of U.S. revenue									5,525						3,617
Total revenue									$	34,473					$	7,717

The following table presents revenue by significant geographical locations outside the United States for the periods presented:

									Year Ended December 31,
									2021						2020
Germany									*						31		%

* Less than 10% of total net revenues for the period indicated.

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