Company: CALX
Filing Date: 2025-02-21
Form Type: 10-K
Source: 0001406666-25-000008
Chunk: 155

Company: CALIX, INC
Filing Date: 2025-02-21
Form: 10-K
Item: Item 8
Chunk 155
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 active markets, quoted prices for identical or similar instruments in markets that are not active, and model-driven valuations in which all significant inputs and significant value drivers are observable in active markets.Level 3 – Unobservable inputs to the valuation derived from fair valuation techniques in which one or more significant inputs or significant value drivers are unobservable. The fair value hierarchy also requires the Company to maximize the use of observable inputs, when available, and to minimize the use of unobservable inputs when determining inputs and determining fair value.The following tables sets forth the Company’s financial assets measured at fair value on a recurring basis based on the three-tier fair value hierarchy (in thousands): As of December 31, 2024Level 1Level 2TotalMoney market funds$4,890 $— $4,890 U.S. government securities74,132 — 74,132 Corporate debt securities— 123,701 123,701 Commercial paper— 32,773 32,773 U.S. government agency securities— 24,411 24,411 Certificates of deposit— 16,520 16,520 $79,022 $197,405 $276,427 As of December 31, 2023Level 1Level 2TotalMoney market funds$2,563 $— $2,563 U.S. government securities102,246 — 102,246 Commercial paper— 46,976 46,976 U.S. government agency securities— 43,521 43,521 Corporate debt securities— 7,000 7,000 $104,809 $97,497 $202,306 

4.  Balance Sheet Details

Accounts receivable, net consisted of the following (in thousands):December 31,20242023Accounts receivable$79,632 $126,331 Allowance for doubtful accounts(311)(304)$79,321 $126,027 The table below summarizes the changes in allowance for doubtful accounts and product return liability for the periods indicated (in thousands):Balance at Beginning of YearAdditions Charged to Expenses or Revenue Net of RecoveriesWrite Offs and ReturnsBalance at End of YearYear Ended December 31, 2024:Allowance for doubtful accounts$304 $264 $(257)$311 Product return liability2,897 3,212 (3,681)2,428 Year Ended December 31,