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Financial Statement Details (Tables) | 12 Months Ended
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Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Summary of Marketable Securities Available-for-Sale |
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 |
Summary of 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 |
Summary of 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 |
Summary of 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 |
Summary of 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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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 2 -Paragraph 6 -Subparagraph a,b,c -Article 5 + Details
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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
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