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Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 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):
September 30,December 31,
20212020
Level 1Level 2Level 3TotalLevel 1Level 2Level 3Total
Cash and cash equivalents:
Cash$179,797 $— $— $179,797 $1,502 $— $— $1,502 
Cash equivalents140,687 — — 140,687 98,628 — — 98,628 
Total cash and cash equivalents$320,484 $— $— $320,484 $100,130 $— $— $100,130 
Preferred stock warrant liability$— $— $— $— $— $— $177 $177 
Loan facility derivative liability$— $— $1,610 $1,610 $— $— $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):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Beginning of the period$129 $749 $177 $870 
Exercised(112)(532)(113)(653)
Cancelled(16)(22)(16)(22)
Change in fair value(1)(67)(48)(67)
End of the period$— $128 $— $128 
Warrants to purchase shares of redeemable convertible preferred stock outstanding and exercisable are as follows (in thousands, except per share data):
Shares Outstanding atFair Value at
DatesExercise
Price		September 30,December 31,Initial
Value		September 30,December 31,
IssuanceExpirationSeries2021202020212020
Jun 2017Jun 2022E13.73 — 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:
December 31,
2020
Expected life (years)1.4
Expected volatility80 %
Risk-free interest rate0.1 %
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):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Beginning of the period$1,787 $1,698 $1,782 $1,482 
Issued— — — — 
Change in fair value(177)(175)(172)41 
Payment of success fee— — — — 
End of the period$1,610 $1,523 $1,610 $1,523 
Revenue from External Customers by Products and Services
The following table presents revenue disaggregated by type and geography (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
U.S.
System sales and rentals$5,038 $646 $14,368 $1,106 
Handpieces and other consumables2,184 451 5,458 930 
Service169 16 378 26 
Total U.S. revenue7,391 1,113 20,204 2,062 
Outside of U.S.
System sales and rentals481 369 1,725 1,111 
Handpieces and other consumables666 596 2,159 1,278 
Service130 29 247 45 
Total outside of U.S. revenue1,277 994 4,131 2,434 
Total revenue$8,668 $2,107 $24,335 $4,496 
Schedule of Earnings Per Share, Basic
Net loss per share was determined as follows (in thousands, except per share amounts):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Net loss$(14,103)$(12,008)$(41,505)$(37,741)
Weighted-average common stock outstanding11,580 4,329 7,361 3,327 
Net loss per share, basic and diluted$(1.22)$(2.77)$(5.64)$(11.34)
Schedule of Earnings Per Share, Diluted
Net loss per share was determined as follows (in thousands, except per share amounts):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Net loss$(14,103)$(12,008)$(41,505)$(37,741)
Weighted-average common stock outstanding11,580 4,329 7,361 3,327 
Net loss per share, basic and diluted$(1.22)$(2.77)$(5.64)$(11.34)
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):
September 30,
20212020
Redeemable convertible preferred stock outstanding— 25,402 
Redeemable convertible preferred stock warrants— 72 
Common stock warrants— 12 
Common stock options6,607 6,143 
Total6,607 31,629 
Revenue from External Customers by Geographic Areas
The following table presents revenue disaggregated by type and geography (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
U.S.
System sales and rentals$5,038 $646 $14,368 $1,106 
Handpieces and other consumables2,184 451 5,458 930 
Service169 16 378 26 
Total U.S. revenue7,391 1,113 20,204 2,062 
Outside of U.S.
System sales and rentals481 369 1,725 1,111 
Handpieces and other consumables666 596 2,159 1,278 
Service130 29 247 45 
Total outside of U.S. revenue1,277 994 4,131 2,434 
Total revenue$8,668 $2,107 $24,335 $4,496 
The following table presents revenue by significant geographical locations outside the United States for the periods presented:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Germany*41%*32%
* Less than 10% of total net revenues for the period indicated.