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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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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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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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