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Balance Sheet Information
 3 Months Ended
Apr. 03, 2022
Balance Sheet Information [Abstract]  
Balance Sheet Information Balance Sheet Information
Certain significant amounts included in our condensed consolidated balance sheets consist of the following:
April 3, 2022January 2, 2022
Accounts receivable, net:
Trade accounts receivable$21,491 $23,022 
Unbilled revenue (contract assets)26,207 16,303 
Other receivables— 56 
Total accounts receivable, net$47,698 $39,381 
April 3, 2022January 2, 2022
Inventories:
Raw materials$3,865 $3,340 
Work-in-process1,390 7,339 
Supplies and spare parts7,858 6,821 
Total inventories—current13,113 17,500 
Supplies and spare parts classified as other assets2,252 2,388 
Total inventories$15,365 $19,888 
April 3, 2022January 2, 2022
Prepaid expenses and other current assets:
Prepaid expenses$3,116 $1,759 
Deferred contract costs2,785 1,579 
Prepaid inventory516 516 
Total prepaid assets and other current assets$6,417 $3,854 

April 3, 2022January 2, 2022
Property and equipment, net:
Land$5,396 $5,396 
Buildings and improvements87,396 87,156 
Machinery and equipment173,924 143,105 
Fixed assets not yet in service11,059 29,229 
Total property and equipment, at cost277,775 264,886 
Less: Accumulated depreciation(90,411)(84,411)
Total property and equipment, net$187,364 $180,475 
Depreciation expense was $6,031 and $6,047 for the three months ended April 3, 2022 and April 4, 2021, respectively. In December 2021, we completed an assessment of the useful lives of our machinery and equipment and adjusted the estimated useful life from seven years to ten years to better reflect the estimated periods during which the assets will remain in service. This change in accounting estimate was effective beginning in December of 2021 on a prospective basis for all machinery and equipment acquired after March 1, 2017, the date in which we became an independent company as part of a divestiture from Cypress. The effect of this change in estimate resulted in a $445 decrease in depreciation expense for the three months ended April 3, 2022.
Intangible assets consist of purchased software and license costs from our acquisition of the business in 2017. Additionally, we have entered into license agreements for third-party software and licensed technology, which also comprise intangible assets. During the three months ended April 3, 2022, we acquired third-party software and licensed technology of
$2,028, which will be amortized over a weighted average estimated life of 8.8 years. Intangible assets are summarized as follows:
April 3, 2022January 2, 2022
Intangible assets, net:
Software and licensed technology$8,653 $6,625 
Customer list— 1,500 
Total intangible assets, at cost8,653 8,125 
Less: Accumulated amortization(3,159)(4,234)
Total intangible assets, net$5,494 $3,891 
For the three months ended April 3, 2022 and April 4, 2021, amortization of the customer list intangible asset charged to operations was $0 and $88, respectively, and amortization of software and licensed technology was $425 and $347, respectively.
Remaining estimated aggregate annual amortization expense is as follows for the years ending:
Amortization
Expense
Remainder of 2022$1,403 
20231,429 
2024754 
2025601 
2026433 
Thereafter874 
Total$5,494 
April 3, 2022January 2, 2022
Other assets:
Supplies and spare parts$2,252 $2,388 
Deferred contract costs862 1,760 
Other assets1,297 687 
Total other assets$4,411 $4,835 
April 3, 2022January 2, 2022
Accrued expenses:
Accrued compensation$5,596 $4,557 
Patents and licensed technology obligations2,000 — 
Accrued commissions241 189 
Accrued fixed asset expenditures1,252 861 
Accrued royalties2,586 1,854 
Capital lease obligations1,597 1,192 
Other accrued expenses10,810 8,830 
Total accrued expenses$24,082 $17,483