Summary of Significant Accounting Policies

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, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions reflected in these condensed consolidated financial statements include, but are not limited to, revenue recognition and accounts receivable, the valuation of inventory, fair value of assets acquired and liabilities assumed in acquisitions and the valuation of stock-based awards. The Company bases its estimates on historical experience, known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. Due to rising inflation and higher interest rates, there has been uncertainty and disruption in the global economy and financial markets. The Company is not aware of any specific event or circumstance that would require further updates to its estimates or judgments or a revision of the carrying value of its assets or liabilities as of the date of issuance of these condensed consolidated financial statements. These estimates may change, as new events occur and additional information is obtained. On an ongoing basis, management evaluates its estimates as there are changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results may differ from those estimates or assumptions.

Accounts Receivable

Accounts receivable are presented net of an allowance for credit losses, which is an estimate of amounts that may not be collectible. The Company performs ongoing credit evaluations of its customers and monitors economic conditions to identify facts and circumstances that may indicate its receivables are at risk of collection. The Company provides reserves against accounts receivable for estimated credit losses, if any, that may result from a customer’s inability to pay based on the composition of its accounts receivable, current economic conditions and historical credit loss activity. Amounts deemed uncollectible are charged or written-off against the reserve. As of September 30, 2023 and December 31, 2022, the Company recorded $0.1 million allowance and less than $0.1 million allowance for credit losses, respectively.


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Balances at beginning of period	$	133	$	1,750	$	25	$	1,750
Current period change for expected credit loss		—		—		108		—
Deduction / recoveries collected		(16)		—		(16)		—
Balances at end of period	$	117	$	1,750	$	117	$	1,750

Marketable Securities

The Company’s marketable securities (non-equity instruments) are classified as available-for-sale and are carried at fair value, with the unrealized gains and losses reported as a component of accumulated other comprehensive income (loss) in

stockholders’ equity. Realized gains and losses are based on the specific identification method and are included as a component of other income (expense), net in the consolidated statements of operations.

When the fair value is below the amortized cost of a marketable security, an estimate of expected credit losses is made. The credit-related impairment amount is recognized in the consolidated statements of operations. Credit losses are recognized through the use of an allowance for credit losses account in the consolidated balance sheet and subsequent improvements in expected credit losses are recognized as a reversal of an amount in the allowance account. If the Company has the intent to sell the security or it is more likely than not that the Company will be required to sell the security prior to recovery of its amortized cost basis, then the allowance for the credit loss is written-off and the excess of the amortized cost basis of the asset over its fair value is recorded in the consolidated statements of operations. There were no credit losses recorded during the nine months ended September 30, 2023.

Revenue Recognition

The Company recognizes revenue from sales to customers under ASC 606, Revenue from Contracts with Customers (“ASC 606”), by applying the following five steps: (1) identification of the contract, or contracts, with a customer, (2) identification of the performance obligations in the contract, (3) determination of the transaction price, (4) allocation of the transaction price to the performance obligations in the contract and (5) recognition of revenue when, or as, performance obligations are satisfied.

For a contract with multiple performance obligations, the Company allocates the contract’s transaction price to each performance obligation on a relative standalone selling price basis using the Company’s best estimate of the standalone selling price of each distinct product or service in the contract. The primary method used to estimate standalone selling price is the price observed in standalone sales to customers; however, when prices in standalone sales are not available the Company may use third party pricing for similar products or services or estimate the standalone selling price, which is set by management. Allocation of the transaction price is determined at the contract’s inception and is not updated to reflect changes between contract inception and when the performance obligations are satisfied.

Product and Service Revenue

The Company derives product and service revenue primarily from the sale of handheld and desktop products and related consumables and services. Revenue is recognized when control of the promised products, consumables or services is transferred to the Company’s customers, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those products, consumables or services (the transaction price). A performance obligation is a promise in a contract to transfer a distinct product or service to a customer and is the unit of accounting under ASC 606. For devices and consumables sold by the Company, control transfers to the customer at a point in time. To indicate the transfer of control, the Company must have a present right to payment, legal title must have passed to the customer, the customer must have the significant risks and rewards of ownership, and where acceptance is other than perfunctory, the customer must have accepted the product or service. The Company’s principal terms of sale are freight on board (“FOB”) shipping point, or equivalent, and, as such, the Company primarily transfers control and records revenue for product sales upon shipment. Sales arrangements with delivery terms that are not FOB shipping point are not recognized upon shipment and the transfer of control for revenue recognition is evaluated based on the associated shipping terms and customer obligations. If a performance obligation to the customer with respect to a sales transaction remains to be fulfilled following shipment (typically installation or acceptance by the customer), revenue recognition for that performance obligation is deferred until such commitments have been fulfilled. For extended warranty and support, control transfers to the customer over the term of the arrangement. Revenue for extended warranty and support is recognized based upon the period of time elapsed under the arrangement as this period represents the transfer of benefits or services under the agreement.

The Company recognizes a receivable at the point in time at which it has an unconditional right to payment. Such receivables are not contract assets. Payment terms for customer orders, including for each of the Company’s primary performance obligations, are typically 30 to 90 days after the shipment or delivery of the product, and such payments typically do not include payments that are variable, dependent on specified factors or events. In limited circumstances, there exists a right of return for a product if agreed to by the Company. Revenue is only recognized for those goods that are not expected to be returned such that it is probable that there will not be a significant reversal of cumulative revenue. Service arrangements commonly call for payments in advance of performing the work (e.g., extended warranty/service contracts), upon completion of the service or a mix of both. The Company does not enter into significant financing agreements or other forms of variable consideration.

Contract assets arise from unbilled amounts in customer arrangements when revenue recognized exceeds the amount billed to the customer and the Company’s right to payment is not only subject to the passage of time. The Company had no contract assets related to product or service revenue as of September 30, 2023 or December 31, 2022.

Contract liabilities represent the Company’s obligation to transfer goods or services to a customer for which it has received consideration (or the amount is due) from the customer. The Company has determined that its only contract liability related to product and service revenue is deferred revenue, which consists of amounts that have been invoiced but that have not been recognized as revenue. Amounts expected to be recognized as revenue within 12 months of the balance sheet date are classified

as current deferred revenue and amounts expected to be recognized as revenue beyond 12 months of the balance sheet date are classified as noncurrent deferred revenue.

The following is a summary of the activity of the Company’s deferred revenue related to product and service revenue (in thousands):


	Nine Months Ended September 30,
	2023		2022
Balances at beginning of period	$	16,510	$	14,521
Recognition of revenue included in balance at beginning of the period		(5,332)		(3,521)
Revenue deferred during the period, net of revenue recognized		8,714		5,891
Balances at end of period	$	19,892	$	16,891

The amount of deferred revenue equals the transaction price allocated to unfulfilled performance obligations for the period presented. Such deferred revenue amounts related to product and service revenue are expected to be recognized in the future as follows (in thousands):


	September 30,		December 31,
	2023		2022
Deferred revenue expected to be recognized in:
One year or less	$	10,521	$	7,514
One to two years		5,885		4,750
Three years and beyond		3,486		4,246
	$	19,892	$	16,510

Contract Revenue

The Company generates revenue from short and long-term contracts associated with the design and development and delivery of detection devices or related design and support services. To date, these contracts are primarily with the U.S. government or commercial entities contracting with the U.S. government, but the Company has also had such contracts with commercial partners. The Company’s contracts with the U.S. government typically are subject to the Federal Acquisition Regulation (“FAR”) and are priced based on estimated or actual costs of producing goods or providing services. The FAR provides guidance on the types of costs that are allowable in establishing prices for goods or services provided under U.S. government contracts. The pricing for non-U.S. government contracts is based on the specific negotiations with each customer.

Under the typical payment terms of U.S. government fixed-price contracts, the customer pays in accordance with the terms of the specific agreement, but generally through progress payments. If these progress payments are made in advance, these payments are recorded as a contract liability, classified as deferred revenue within the accompanying condensed consolidated balance sheet, until the Company provides the underlying services. For U.S. government cost-type contracts, the customer generally pays for actual costs incurred within a short period of time. For contracts with commercial partners, payments are made in accordance with the terms of the specific agreement. For agreements which call for milestone payments, to the extent the Company does not conclude that it is probable that a significant reversal of cumulative revenue will occur, a contract asset is generated until the Company is permitted to bill for costs incurred, which is classified as prepaid expense and other current assets in the accompanying condensed consolidated balance sheet. In some cases, payments received in advance under contract agreements are recorded as deferred revenue and recognized over the respective contract term, absent any other performance obligations.

Generally, revenue for long-term contracts is recognized based upon the cost-to-cost measure of progress, provided that the Company meets the criteria associated with transferring control of the good or service over time such as not creating an asset with an alternative use and having an enforceable right to payment for completed performance. However, the Company evaluates the proper revenue recognition on a contract by contract basis, as each contract generally contains terms specific to the underlying agreement which result in differing performance obligations and payment terms (cost plus, fixed price agreements among others). For revenue recognized under the cost-to-cost measure of progress basis, the Company continually assesses total costs expected to be incurred and if such costs require adjustment to the measure of progress, the Company records such adjustment as a change in estimate on a cumulative catch-up basis in the period of adjustment.

The Company includes the unconstrained amount of consideration in the transaction price. The amount included in the transaction price is constrained to the amount for which it is probable that a significant reversal of cumulative revenue recognized will not occur. At the end of each subsequent reporting period, as required under ASC 606, the Company re-evaluates the estimated consideration included in the transaction price and any related constraint, and if necessary, adjusts its estimate of the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis in the period of adjustment.

Contract assets arise from unbilled amounts in customer arrangements when revenue recognized exceeds the amount billed to the customer and the Company’s right to payment is not just subject to the passage of time. The Company includes contract assets within prepaid and other current assets in the accompanying condensed consolidated balance sheet. The Company had no contract assets related to contract revenue as of September 30, 2023 and $0.4 million contract assets related to contract revenue as of December 31, 2022.

Contract liabilities represent the Company’s obligation to transfer goods or services to a customer for which it has received consideration (or the amount is due) from the customer. As of September 30, 2023, the Company had no contract liabilities. The Company recognizes deferred revenue by first allocating from the beginning deferred revenue balance to the extent that the beginning deferred revenue balance exceeds the revenue to be recognized. Billings during the period are added to the deferred revenue balance to be recognized in future periods. As of September 30, 2023, the Company held no wholly- or partially-unsatisfied performance obligations related to contract agreements entered prior to period end.

Distribution Channels

A majority of the Company’s revenue is generated by sales in conjunction with its distribution partners, such as its international distributors and, in the United States, for end customers where a government contract is required or a customer has a pre-existing relationship. When the Company transacts with a distribution partner, its contractual arrangement is with the partner and not with the end-use customer. Whether the Company transacts business with and receives the order from a distribution partner or directly from an end-use customer, its revenue recognition policy and resulting pattern of revenue recognition for the order are the same.

Disaggregated Revenue

The Company’s product and service revenue consists of sales of devices and recurring revenue which includes consumables, accessories and the sale of service and extended warranty plans. The following table presents the Company’s revenue by revenue stream (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Product and service revenue:
Device sales revenue	$	10,719	$	10,952	$	23,761	$	24,239
Recurring revenue		3,578		4,485		11,747		9,835
Total product and service revenue		14,297		15,437		35,508		34,074
Contract revenue		—		360		370		1,135
Total revenue	$	14,297	$	15,797	$	35,878	$	35,209

The following table presents the Company’s product and service revenue by device type (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Handheld revenue:
Device sales revenue	$	9,681	$	8,051	$	19,929	$	16,782
Recurring revenue		2,067		2,968		6,813		5,645
Total handheld revenue		11,748		11,019		26,742		22,427
Desktop revenue:
Device sales revenue		1,039		2,901		3,832		7,458
Recurring revenue		1,510		1,517		4,934		4,189
Total desktop revenue		2,549		4,418		8,766		11,647
Total product and service revenue	$	14,297	$	15,437	$	35,508	$	34,074

Revenue based on the end-user entity type for the Company’s product and service revenue are presented below (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
Government	$	11,740	$	11,069	$	26,732	$	22,788
Pharmaceutical/Biotechnology		2,546		4,327		8,705		11,032
Academia and other		11		41		71		254
Total product and service revenue	$	14,297	$	15,437	$	35,508	$	34,074

The following table disaggregates the Company’s revenue from contracts with customers by geography, which are determined based on the customer location (in thousands):


	Three Months Ended September 30,				Nine Months Ended September 30,
	2023		2022		2023		2022
United States	$	12,417	$	12,403	$	26,769	$	27,916
Europe, Middle East and Africa		1,456		2,361		7,398		4,961
Asia Pacific		394		996		1,191		2,270
Americas other		30		37		520		62
	$	14,297	$	15,797	$	35,878	$	35,209

International sales are comprised primarily of product and service revenue, with the majority of contract revenue being attributable to North America.

Other Comprehensive income (Loss)

Other comprehensive income (loss) refers to revenues, expenses, gains and losses that are excluded from net loss as these amounts are recorded directly as an adjustment to shareholders' equity, net of tax. The Company's other comprehensive income (loss) was composed of foreign currency translation adjustments and unrealized gains/losses on available-for-sale marketable securities.

Business combination

Under the acquisition method of accounting, the Company generally recognizes the tangible and identifiable intangible assets acquired and liabilities assumed based on their estimated fair values on the date of acquisition. The fair values assigned, defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between willing market participants, are based on estimates and assumptions determined by management. The excess consideration over the aggregate value of tangible and intangible assets, net of liabilities assumed, is recorded as goodwill. These valuations require significant estimates and assumptions, especially with respect to intangible assets.

The Company estimates the fair value of the contingent consideration earnouts using the Monte Carlo Simulation or probability weighted scenario depending on the nature of the contingent consideration and updates the fair value of the contingent consideration at each reporting period based on the estimated probability of achieving the earnout targets and applying a discount rate that captures the risk associated with the expected contingent payments. To the extent that these estimates change in the future regarding the likelihood of achieving these targets, the Company may need to record material adjustments to its accrued contingent consideration. Such changes in the fair value of contingent consideration are recorded as contingent consideration expense or income in the consolidated statements of operations.

The Company uses the income approach to determine the fair value of certain identifiable intangible assets including customer relationships and developed technology. This approach determines fair value by estimating after-tax cash flows attributable to these assets over their respective useful lives and then discounting these after-tax cash flows back to a present value. The Company bases its assumptions on estimates of future cash flows, expected growth rates, expected trends in technology, probabilities of customer renewals, etc. The Company bases the discount rates used to arrive at a present value as of the date of acquisition on the time value of money and certain industry-specific risk factors. The Company believes the estimated purchased customer relationships, developed technology, software and trade name amounts determined represent the fair value at the date of acquisition and do not exceed the amount a third-party would pay for the assets.