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Financial Statement Details | 12 Months Ended
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Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Financial Statement Details | Financial Statement Details Marketable Securities The Company did not have any short-term or long-term marketable securities at December 31, 2014. The following table summarizes the Company’s portfolio of available-for-sale securities by contractual maturity as of December 31, 2013 (in thousands):
December 31, 2013 | Maturity in Years |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Available-for-sale: |  |  |  |  |  |  |  |  |
Government agency securities | 1 or less |  | $ | 2,350 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 2,351 |
Municipal bonds | 1 or less |  | 2,828 |  |  | 1 |  |  | — |  |  | 2,829 |
Certificates of deposit | 1 or less |  | 3,360 |  |  | — |  |  | — |  |  | 3,360 |
Corporate debentures / bonds | 1 or less |  | 10,635 |  |  | 3 |  |  | — |  |  | 10,638 |
Total short-term marketable securities |  |  | 19,173 |  |  | 5 |  |  | — |  |  | 19,178 |
Available-for-sale: |  |  |  |  |  |  |  |  |
Certificates of deposit | 1 to 2 |  | 1,300 |  |  | — |  |  | — |  |  | 1,300 |
Corporate debentures / bonds | 1 to 2 |  | 2,143 |  |  | — |  |  | — |  |  | 2,143 |
Total long-term marketable securities |  |  | 3,443 |  |  | — |  |  | — |  |  | 3,443 |
|  |  | $ | 22,616 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 22,621 |
The Company’s available-for-sale securities are carried on the consolidated balance sheet at fair market value with the related unrealized gains and losses included in accumulated other comprehensive loss on the consolidated balance sheet, which is a separate component of stockholders’ equity. Realized gains and losses on the sale of available-for-sale marketable securities are determined using the specific-identification method. At December 31, 2014 and 2013, the Company recorded net unrealized gains of $0 and $5,000, respectively. The Company’s net unrealized loss is the result of market conditions affecting its fixed-income debt securities, which are included in accumulated other comprehensive income on the consolidated balance sheet for the periods then ended. Inventories Inventories consist of the following (in thousands):
| December 31,
| 2014 |  | 2013
Finished goods | $ | 33,045 |  |  | $ | 20,870 |
Raw materials and components | 4,758 |  |  | 6,923 |
| $ | 37,803 |  |  | $ | 27,793 |
Property and Equipment Property and equipment consists of the following (in thousands):
| December 31,
| 2014 |  | 2013
Test equipment | $ | 53,019 |  |  | $ | 52,108 |
Computer equipment and purchased software | 11,247 |  |  | 10,814 |
Product tooling | 3,535 |  |  | 3,204 |
Furniture and fixtures | 1,824 |  |  | 2,015 |
Leasehold improvements | 4,103 |  |  | 4,094 |
| 73,728 |  |  | 72,235 |
Less—accumulated depreciation and amortization | (68,449 | ) |  | (62,334 | )
| $ | 5,279 |  |  | $ | 9,901 |
For the years ended December 31, 2014, 2013 and 2012, the Company recorded $0, $70,000 and $100,000, respectively, in its cost of net revenues as a result of its impairment analysis of property and equipment. Depreciation expense relating to property and equipment was $6.3 million, $7.9 million and $9.4 million for the years ended December 31, 2014, 2013 and 2012, respectively. Accrued Expenses Accrued expenses consist of the following (in thousands):
| December 31,
| 2014 |  | 2013
Royalties | $ | 4,035 |  |  | $ | 4,243 |
Payroll and related expenses | 8,038 |  |  | 4,828 |
Product warranty | 1,196 |  |  | 2,244 |
Market development funds and price protection | 2,502 |  |  | 3,059 |
Professional fees | 780 |  |  | 1,040 |
Deferred revenue | 962 |  |  | 2,999 |
Restructuring | 1,886 |  |  | 610 |
Other | 4,445 |  |  | 4,248 |
| $ | 23,844 |  |  | $ | 23,271 |
Accrued Warranty Obligations Accrued warranty obligations consist of the following (in thousands):
| December 31,
| 2014 |  | 2013
Warranty liability at beginning of period | $ | 2,244 |  |  | $ | 2,329 |
Additions charged to operations | 1,345 |  |  | 5,055 |
Deductions from liability | (2,393 | ) |  | (5,140 | )
Warranty liability at end of period | $ | 1,196 |  |  | $ | 2,244 |

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