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Note 4 - BALANCE SHEET COMPONENTS | 6 Months Ended
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Jun. 30, 2022
BALANCE SHEET COMPONENTS |
4. BALANCE SHEET COMPONENTS | 4. BALANCE SHEET COMPONENTS Accounts receivable Accounts receivable include amounts that are unbilled at the end of the period that are expected to be billed and collected within a 12-month period. Unbilled accounts receivable, included in accounts receivable, totaled $8.9 million and $11.8 million as of June 30, 2022, and December 31, 2021, respectively. Unbilled accounts receivable that are not expected to be billed and collected during the succeeding 12-month period is recorded in other non-current assets and totaled $1.1 million and $1.3 million as of June 30, 2022, and December 31, 2021, respectively. The Company performs ongoing credit evaluations of its customers’ financial condition. An allowance for doubtful accounts is maintained for probable credit losses based upon the Company’s assessment of the expected collectability of the accounts receivable. The allowance for doubtful accounts is reviewed on a quarterly basis to assess the adequacy of the allowance. Property and equipment Property and equipment, net consist of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Computer equipment | ​ | $ | 11,640 | ​ | $ | 11,924
Software | ​ |  | 5,391 | ​ |  | 5,419
Furniture, fixtures and equipment | ​ |  | 2,491 | ​ |  | 2,506
Leasehold improvements | ​ |  | 6,294 | ​ |  | 6,272
Laboratory and other equipment | ​ |  | 4,249 | ​ |  | 3,981
Test equipment | ​ |  | 28,204 | ​ |  | 24,452
Construction-in-progress | ​ |  | 23,690 | ​ |  | 22,158
​ | ​ |  | 81,959 | ​ |  | 76,712
Less: accumulated depreciation and amortization | ​ |  | (43,569) | ​ |  | (41,417)
Total | ​ | $ | 38,390 | ​ | $ | 35,295
​ Test equipment mainly includes DFI™ systems and CV® systems assets at customer sites that are contributing to revenue. Among assets under construction, the construction-in-progress balance related to construction of DFI™ systems assets amounted to $19.8 million and $20.0 million as of June 30, 2022, and December 31, 2021, respectively. Depreciation and amortization expense was $1.4 million and $1.6 million during the three months ended June 30, 2022 and 2021, respectively, and $2.8 million and $3.3 million during the six months ended June 30, 2022 and 2021, respectively. In the fourth quarter of 2021, the Company wrote down the value of its property and equipment by $3.2 million related to its first-generation of e-beam tools for DFI™ systems wherein carrying values may not be fully recoverable due to lack of market demand and future needs of our customers for these tools. Goodwill and Intangible Assets, Net As of June 30, 2022, and December 31, 2021, the carrying amount of goodwill was $14.1 million. Intangible assets, net, consisted of the following (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | June 30, 2022 | ​ | December 31, 2021
​ | ​ | Amortization | ​ | Gross | ​ | ​ | ​ | ​ | Net | ​ | Gross | ​ | ​ | ​ | ​ | Net
​ | ​ | Period | ​ | Carrying | ​ | Accumulated | ​ | Carrying | ​ | Carrying | ​ | Accumulated | ​ | Carrying
​ | ​ | (Years) |  | Amount |  | Amortization |  | Amount |  | Amount |  | Amortization |  | Amount
Acquired identifiable intangibles: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer relationships |  | 1-10 | ​ | $ | 9,407 | ​ | $ | (6,363) | ​ | $ | 3,044 | ​ | $ | 9,407 | ​ | $ | (6,041) | ​ | $ | 3,366
Developed technology |  | 4-9 | ​ |  | 33,635 | ​ |  | (18,447) | ​ |  | 15,188 | ​ |  | 33,635 | ​ |  | (17,250) | ​ |  | 16,385
Tradename and trademarks |  | 2-10 | ​ |  | 1,598 | ​ |  | (865) | ​ |  | 733 | ​ |  | 1,598 | ​ |  | (812) | ​ |  | 786
Patent |  | 7-10 | ​ |  | 1,800 | ​ |  | (1,660) | ​ |  | 140 | ​ |  | 1,800 | ​ |  | (1,640) | ​ |  | 160
Noncompetition agreements |  | 3 | ​ |  | 848 | ​ |  | (448) | ​ |  | 400 | ​ |  | 848 | ​ |  | (306) | ​ |  | 542
Total | ​ | ​ | ​ | $ | 47,288 | ​ | $ | (27,783) | ​ | $ | 19,505 | ​ | $ | 47,288 | ​ | $ | (26,049) | ​ | $ | 21,239
The weighted average amortization period for acquired identifiable intangible assets was 6.4 years as of June 30, 2022. The following table summarizes intangible assets amortization expense in the Condensed Consolidated Statements of Comprehensive Loss (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021
Amortization of acquired technology included under Costs of Revenues | ​ | $ | 553 | ​ | $ | 536 | ​ | $ | 1,106 | ​ | $ | 1,071
Amortization of acquired intangible assets presented separately under Costs and Expenses | ​ |  | 314 | ​ |  | 313 | ​ |  | 628 | ​ |  | 627
Total amortization of acquired intangible assets | ​ | $ | 867 | ​ | $ | 849 | ​ | $ | 1,734 | ​ | $ | 1,698
The Company expects annual amortization of acquired identifiable intangible assets to be as follows (in thousands):
​ | ​ | ​ | ​
Year Ending December 31, |  | Amount
2022 (remaining six months) | ​ | $ | 1,734
2023 | ​ |  | 3,444
2024 | ​ |  | 3,046
2025 | ​ |  | 2,882
2026 | ​ |  | 2,712
2027 and thereafter | ​ |  | 5,687
Total future amortization expense | ​ | $ | 19,505
​ There were no impairment charges for goodwill and intangible assets during the three and six months ended June 30, 2022 and 2021.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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