Summary of Significant Accounting Policies	6 Months Ended
Jun. 30, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of presentation The accompanying financial statements have been prepared using accounting principles generally accepted in the United States of America (GAAP). Certain prior year amounts have been reclassified to conform to the current year presentation. Reverse Stock Split On October 14, 2021, the Company effected a 1-for-6.046 reverse stock split of its outstanding common stock and redeemable convertible preferred stock. Upon the effectiveness of the reverse stock split, all issued and outstanding shares of common stock, options to purchase common stock, warrants, instruments convertible to shares, redeemable convertible preferred stock and related share data and per share amounts contained in the accompanying financial statements were retroactively revised to reflect this reverse stock split for all periods presented. The par value of the authorized stock was not adjusted as a result of the reverse stock split. Unaudited interim financial information The accompanying condensed balance sheet as of June 30, 2022, the condensed statements of operations, the condensed statements of redeemable convertible preferred stock and stockholders’ equity and condensed statements of cash flows for the three- and six-month periods ended June 30, 2022 and 2021 are unaudited. The unaudited interim condensed financial statements have been prepared on the same basis as the 2021 audited annual financial statements and, in the opinion of management, reflect all adjustments, which include normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of June 30, 2022 and the results of its operations and its cash flows for the three- and six-month periods ended June 30, 2022 and 2021. The financial data and other information disclosed in these notes related to the three- and six-month periods ended June 30, 2022 and 2021 are also unaudited. The results for the three- and six-month period ended June 30, 2022 are not necessarily indicative of results to be expected for the year ending December 31, 2022, any other interim periods, or any future year or period. The balance sheet as of December 31, 2021 included herein was derived from the audited financial statements as of that date. Certain disclosures have been condensed or omitted from the interim condensed financial statements. These unaudited interim condensed financial statements should be read in conjunction with the audited annual financial statements and related notes. The significant accounting policies used in the preparation of the unaudited condensed financial statements for the three- and six-month periods ended June 30, 2022 and 2021, are consistent with those discussed in Note 2 to the audited financial statements and notes thereto for the year ended December 31, 2021, included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2021 filed with the Securities and Exchange Commission (SEC) on March 23, 2022. There have been no significant changes in the significant accounting policies or critical accounting estimates since December 31, 2021, except for the accounting policy related to ASU 2016-02, Leases discussed below. Use of estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Although these estimates are based on the Company’s knowledge of current events and actions it may undertake in the future, actual results may ultimately materially differ from these estimates and assumptions. Significant estimates and assumptions include accounts receivable allowances, inventory allowances, recoverability of long-term assets, valuation of equity instruments and equity-linked instruments, valuation of common stock, stock-based compensation, contingent consideration liability, valuation of the redeemable convertible preferred stock warrant liability and derivative liabilities, deferred tax assets and related valuation allowances, impact of contingencies and the Company’s incremental borrowing rate used to calculate lease assets. Fair value of financial instruments The carrying amounts of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, and accrued liabilities, approximate their fair value due to the short-term nature of these assets and liabilities. Based on the borrowing rates currently available to the Company for debt with similar terms and consideration of default and credit risk, the carrying value of the term loan approximates its fair value. Concentration of credit risk Financial instruments that potentially subject the Company to concentrations of risk consist principally of cash, cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents balances with established financial institutions and, at times, such balances with any one financial institution may be in excess of the Federal Deposit Insurance Corporation (FDIC) insured limits. The Company earns revenue from sale of disposable devices and controllers to customers such as hospitals, ambulatory surgical centers and physician offices. The Company’s accounts receivable are derived from revenue earned from customers. The Company performs ongoing credit evaluations of its customers’ financial condition and generally requires no collateral from its customers. At June 30, 2022 and 2021, and for the periods then ended, no customer accounted for more than 10.0% of accounts receivable or revenue. Concentration of suppliers The Company purchases certain components of its products from a single or small number of suppliers. A change in or loss of these suppliers could cause a delay in filling customer orders and a possible loss of sales, which could adversely affect our results of operations; however, management believes that suitable replacement suppliers could be obtained in such an event. Lease Prior to January 1, 2022, the Company met the requirements to account for leases of its facilities as operating leases under ASC 840. The Company recognized rent expense on a straight-line basis over the non-cancellable lease term. Where leases contain escalation clauses, rent abatements or concessions, such as rent holidays and landlord or tenant incentives or allowances, the Company applied them in the determination of straight-line rent expense over the lease term. The Company recorded the difference between the rent paid and the straight-line rent as a deferred rent liability. Upon adoption of ASU 2016-02, Leases (Topic 842), and the related amendments (ASC 842), on January 1, 2022, the Company determines if an arrangement includes a lease at inception by assessing whether there is an identified asset and whether the contract conveys the right to control the use of the identified asset for a period of time in exchange for consideration. Operating leases with a term of more than one year are included in operating lease right-of-use (ROU) assets and operating lease liabilities on the Company's balance sheet. ROU assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the obligation to make lease payments. Operating lease ROU assets and liabilities are recognized on the lease commencement date based on the present value of the future minimum lease payments over the lease term. The Company uses the incremental borrowing rate commensurate with the lease term based on the information available at the lease commencement date in determining the present value of the lease payments as the Company's leases generally do not provide an implicit rate. ROU assets initially equal the lease liability, adjusted for any prepaid lease payments and initial direct costs incurred, less any lease incentives received. Lease expense is recognized on a straight-line basis over the lease term when leases are operating leases. For a finance lease, expense is recognized over the lease term within interest expense and amortization in the Company’s statements of operations. The Company also has lease arrangements with lease and non-lease components. The Company elected the practical expedient not to separate non-lease components from lease components for the Company's facility leases and to account for the lease and non-lease components as a single lease component. The Company also elected to apply the short-term lease measurement and recognition exemption in which ROU assets and lease liabilities are not recognized for leases with terms of twelve months or less. Variable lease payments are expensed as incurred. Assumptions made by the Company at the commencement date are re-evaluated upon occurrence of certain events, including a lease modification. A lease modification results in a separate contract when the modification grants the lessee an additional right of use not included in the original lease and when lease payments increase commensurate with the standalone price for the additional right of use. When a lease modification results in a separate contract, it is accounted for in the same manner as a new lease. Net loss per share attributable to common stockholders Basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders, by the weighted-average number of common shares outstanding during the period, without consideration for potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares and potentially dilutive securities outstanding for the period. For purposes of the diluted net loss per share calculation, redeemable convertible preferred stock, redeemable convertible preferred stock warrants, convertible notes, common stock subject to repurchase, restricted stock units and common stock options are considered to be potentially dilutive securities. Basic and diluted net loss attributable to common stockholders per share is presented in conformity with the two-class method required for participating securities as the redeemable convertible preferred stock is considered a participating security because it participates in dividends with common stock. The Company also considers the shares issued upon the early exercise of stock options subject to repurchase to be participating securities, because holders of such shares have non-forfeitable dividend rights in the event a dividend is paid on common stock. The holders of all series of redeemable convertible preferred stock did not have a contractual obligation to share in the Company’s losses for the three- and six-month period ended June 30, 2021. Prior to the three- and six-month period ended June 30, 2022 all the redeemable convertible preferred stock were converted into shares of common stock. As such, the net loss was attributed entirely to common stockholders. Because the Company has reported a net loss for the three- and six-month periods ended June 30, 2022 and 2021, diluted net loss per common share is the same as basic net loss per common share for the two periods presented.

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2022

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of presentation

The accompanying financial statements have been prepared using accounting principles generally accepted in the United States of America (GAAP). Certain prior year amounts have been reclassified to conform to the current year presentation.

Reverse Stock Split

On October 14, 2021, the Company effected a 1-for-6.046 reverse stock split of its outstanding common stock and redeemable convertible preferred stock. Upon the effectiveness of the reverse stock split, all issued and outstanding shares of common stock, options to purchase common stock, warrants, instruments convertible to shares, redeemable convertible preferred stock and related share data and per share amounts contained in the accompanying financial statements were retroactively revised to reflect this reverse stock split for all periods presented. The par value of the authorized stock was not adjusted as a result of the reverse stock split.

Unaudited interim financial information

The accompanying condensed balance sheet as of June 30, 2022, the condensed statements of operations, the condensed statements of redeemable convertible preferred stock and stockholders’ equity and condensed statements of cash flows for the three- and six-month periods ended June 30, 2022 and 2021 are unaudited. The unaudited interim condensed financial statements have been prepared on the same basis as the 2021 audited annual financial statements and, in the opinion of management, reflect all adjustments, which include normal recurring adjustments, necessary for the fair statement of the Company’s financial position as of June 30, 2022 and the results of its operations and its cash flows for the three- and six-month periods ended June 30, 2022 and 2021. The financial data and other information disclosed in these notes related to the three- and six-month periods ended June 30, 2022 and 2021 are also unaudited. The results for the three- and six-month period ended June 30, 2022 are not necessarily indicative of results to be expected for the year ending December 31, 2022, any other interim periods, or any future year or period. The balance sheet as of December 31, 2021 included herein was derived from the audited financial statements as of that date. Certain disclosures have been condensed or omitted from the interim condensed financial statements. These unaudited interim condensed financial statements should be read in conjunction with the audited annual financial statements and related notes. The significant accounting policies used in the preparation of the unaudited condensed financial statements for the three- and six-month periods ended June 30, 2022 and 2021, are consistent with those discussed in Note 2 to the audited financial statements and notes thereto for the year ended December 31, 2021, included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2021 filed with the Securities and Exchange Commission (SEC) on March 23, 2022. There have been no significant changes in the significant accounting policies or critical accounting estimates since December 31, 2021, except for the accounting policy related to ASU 2016-02, Leases discussed below.

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Although these estimates are based on the Company’s knowledge of current events and actions it may undertake in the future, actual results may ultimately materially differ from these estimates and assumptions.

Significant estimates and assumptions include accounts receivable allowances, inventory allowances, recoverability of long-term assets, valuation of equity instruments and equity-linked instruments, valuation of common stock, stock-based compensation, contingent consideration liability, valuation of the redeemable convertible preferred stock warrant liability and derivative liabilities, deferred tax assets and related valuation allowances, impact of contingencies and the Company’s incremental borrowing rate used to calculate lease assets.

Fair value of financial instruments

The carrying amounts of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, and accrued liabilities, approximate their fair value due to the short-term nature of these assets and liabilities. Based on the borrowing rates currently available to the Company for debt with similar terms and consideration of default and credit risk, the carrying value of the term loan approximates its fair value.

Concentration of credit risk

Financial instruments that potentially subject the Company to concentrations of risk consist principally of cash, cash equivalents and accounts receivable. The Company maintains its cash and cash equivalents balances with established financial institutions and, at times, such balances with any one financial institution may be in excess of the Federal Deposit Insurance Corporation (FDIC) insured limits.

The Company earns revenue from sale of disposable devices and controllers to customers such as hospitals, ambulatory surgical centers and physician offices. The Company’s accounts receivable are derived from revenue earned from customers. The Company performs ongoing credit evaluations of its customers’ financial condition and generally requires no collateral from its customers. At June 30, 2022 and 2021, and for the periods then ended, no customer accounted for more than 10.0% of accounts receivable or revenue.

Concentration of suppliers

The Company purchases certain components of its products from a single or small number of suppliers. A change in or loss of these suppliers could cause a delay in filling customer orders and a possible loss of sales, which could adversely affect our results of operations; however, management believes that suitable replacement suppliers could be obtained in such an event.

Lease

Prior to January 1, 2022, the Company met the requirements to account for leases of its facilities as operating leases under ASC 840. The Company recognized rent expense on a straight-line basis over the non-cancellable lease term. Where leases contain escalation clauses, rent abatements or concessions, such as rent holidays and landlord or tenant incentives or allowances, the Company applied them in the determination of straight-line rent expense over the lease term. The Company recorded the difference between the rent paid and the straight-line rent as a deferred rent liability.

Upon adoption of ASU 2016-02, Leases (Topic 842), and the related amendments (ASC 842), on January 1, 2022, the Company determines if an arrangement includes a lease at inception by assessing whether there is an identified asset and whether the contract conveys the right to control the use of the identified asset for a period of time in exchange for consideration. Operating leases with a term of more than one year are included in operating lease right-of-use (ROU) assets and operating lease liabilities on the Company's balance sheet. ROU assets represent the Company's right to use an underlying asset for the lease term and lease liabilities represent the obligation to make lease payments. Operating lease ROU assets and liabilities are recognized on the lease commencement date based on the present value of the future minimum lease payments over the lease term. The Company uses the incremental borrowing rate commensurate with the lease term based on the information available at the lease commencement date in determining the present value of the lease payments as the Company's leases generally do not provide an implicit rate. ROU assets initially equal the lease liability, adjusted for any prepaid lease payments and initial direct costs incurred, less any lease incentives received. Lease expense is recognized on a straight-line basis over the lease term when leases are operating leases. For a finance lease, expense is recognized over the lease term within interest expense and amortization in the Company’s statements of operations. The Company also has lease arrangements with lease and non-lease components. The Company elected the practical expedient not to separate non-lease components from lease components for the Company's facility leases and to account for the lease and non-lease components as a single lease component. The Company also elected to apply the short-term lease measurement and recognition exemption in which ROU assets and lease liabilities are not recognized for leases with terms of twelve months or less. Variable lease payments are expensed as incurred.

Assumptions made by the Company at the commencement date are re-evaluated upon occurrence of certain events, including a lease modification. A lease modification results in a separate contract when the modification grants the lessee an additional right of use not included in the original lease and when lease payments increase commensurate with the standalone price for the additional right of use. When a lease modification results in a separate contract, it is accounted for in the same manner as a new lease.

Net loss per share attributable to common stockholders

Basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders, by the weighted-average number of common shares outstanding during the period, without consideration for potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares and potentially dilutive securities outstanding for the period. For purposes of the diluted net loss per share calculation, redeemable convertible preferred stock, redeemable

convertible preferred stock warrants, convertible notes, common stock subject to repurchase, restricted stock units and common stock options are considered to be potentially dilutive securities. Basic and diluted net loss attributable to common stockholders per share is presented in conformity with the two-class method required for participating securities as the redeemable convertible preferred stock is considered a participating security because it participates in dividends with common stock. The Company also considers the shares issued upon the early exercise of stock options subject to repurchase to be participating securities, because holders of such shares have non-forfeitable dividend rights in the event a dividend is paid on common stock. The holders of all series of redeemable convertible preferred stock did not have a contractual obligation to share in the Company’s losses for the three- and six-month period ended June 30, 2021. Prior to the three- and six-month period ended June 30, 2022 all the redeemable convertible preferred stock were converted into shares of common stock. As such, the net loss was attributed entirely to common stockholders. Because the Company has reported a net loss for the three- and six-month periods ended June 30, 2022 and 2021, diluted net loss per common share is the same as basic net loss per common share for the two periods presented.