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Financial Statement Details (Tables) | 12 Months Ended
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Dec. 31, 2012
Financial Statement Details [Abstract] |
Summary of Marketable Securities | The Company’s portfolio of available-for-sale securities by contractual maturity consists of the following (in thousands):
December 31, 2012 |  | Maturity in Years |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  |  | 1 or less |  |  | $ | 3,265 |  |  | $ | 1 |  |  | $ | 0 |  |  | $ | 3,266 |
Municipal bonds |  |  | 1 or less |  |  |  | 11,246 |  |  |  | 14 |  |  |  | 0 |  |  |  | 11,260 |
Certificates of deposit |  |  | 1 or less |  |  |  | 6,200 |  |  |  | 5 |  |  |  | 0 |  |  |  | 6,205 |
Corporate debentures / bonds |  |  | 1 or less |  |  |  | 17,330 |  |  |  | 3 |  |  |  | 0 |  |  |  | 17,333 |
Total short-term marketable securities |  |  |  |  |  |  | 38,041 |  |  |  | 23 |  |  |  | 0 |  |  |  | 38,064 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 1 to 2 |  |  |  | 1,200 |  |  |  | 1 |  |  |  | 0 |  |  |  | 1,201 |
Total long-term marketable securities |  |  |  |  |  |  | 1,200 |  |  |  | 1 |  |  |  | 0 |  |  |  | 1,201 |
|  |  |  |  |  | $ | 39,241 |  |  | $ | 24 |  |  | $ | 0 |  |  | $ | 39,265 |
December 31, 2011 |  | Maturity in Years |  |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  |  | 1 or less |  |  | $ | 6,913 |  |  | $ | 0 |  |  | $ | (1 | ) |  | $ | 6,912 |
Municipal bonds |  |  | 1 or less |  |  |  | 8,390 |  |  |  | 0 |  |  |  | (6 | ) |  |  | 8,384 |
Certificates of deposit |  |  | 1 or less |  |  |  | 4,319 |  |  |  | 2 |  |  |  | 0 |  |  |  | 4,321 |
Corporate debentures / bonds |  |  | 1 or less |  |  |  | 8,615 |  |  |  | 0 |  |  |  | (3 | ) |  |  | 8,612 |
Marketable equity securities |  |  | 1 or less |  |  |  | 38 |  |  |  | 0 |  |  |  | 0 |  |  |  | 38 |
Total short-term marketable securities |  |  |  |  |  |  | 28,275 |  |  |  | 2 |  |  |  | (10 | ) |  |  | 28,267 |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  |  | 1 to 2 |  |  |  | 3,734 |  |  |  | 4 |  |  |  | 0 |  |  |  | 3,738 |
Municipal bonds |  |  | 1 to 2 |  |  |  | 5,967 |  |  |  | 2 |  |  |  | 0 |  |  |  | 5,969 |
Certificates of deposit |  |  | 1 to 2 |  |  |  | 3,797 |  |  |  | 0 |  |  |  | (9 | ) |  |  | 3,788 |
Total long-term marketable securities |  |  |  |  |  |  | 13,498 |  |  |  | 6 |  |  |  | (9 | ) |  |  | 13,495 |
|  |  |  |  |  | $ | 41,773 |  |  | $ | 8 |  |  | $ | (19 | ) |  | $ | 41,762 |
Summary of inventories | Inventories consist of the following (in thousands):
|  | December 31, |
|  | 2012 |  |  | 2011 |
Finished goods |  | $ | 26,776 |  |  | $ | 35,211 |
Raw materials and components |  |  | 12,240 |  |  |  | 7,068 |
|  | $ | 39,016 |  |  | $ | 42,279 |
Summary of Property and Equipment | Property and equipment consists of the following (in thousands):
|  | December 31, |
|  | 2012 |  |  | 2011 |
Test equipment |  | $ | 53,368 |  |  | $ | 52,311 |
Computer equipment and purchased software |  |  | 12,310 |  |  |  | 13,766 |
Product tooling |  |  | 2,232 |  |  |  | 3,768 |
Furniture and fixtures |  |  | 2,219 |  |  |  | 2,240 |
Leasehold improvements |  |  | 4,802 |  |  |  | 5,628 |
|  |  | 74,931 |  |  |  | 77,713 |
Less—accumulated depreciation and amortization |  |  | (59,702 | ) |  |  | (59,217 | )
|  | $ | 15,229 |  |  | $ | 18,496 |
Summary of accrued Expenses | Accrued expenses consist of the following (in thousands):
|  | December 31, |
|  | 2012 |  |  | 2011 |
Royalties |  | $ | 4,349 |  |  | $ | 5,861 |
Payroll and related expenses |  |  | 7,788 |  |  |  | 8,706 |
Product warranty |  |  | 2,329 |  |  |  | 1,525 |
Market development funds and price protection |  |  | 2,147 |  |  |  | 1,750 |
Deferred rent |  |  | 573 |  |  |  | 1,135 |
Professional fees |  |  | 1,549 |  |  |  | 1,213 |
Deferred revenue |  |  | 4,630 |  |  |  | 1,060 |
Other |  |  | 4,435 |  |  |  | 3,794 |
|  | $ | 27,800 |  |  | $ | 25,044 |
Summary of accrued warranty obligations | Accrued warranty obligations consist of the following (in thousands):
|  | 2012 |  |  | 2011 |
Warranty liability at beginning of period |  | $ | 1,525 |  |  | $ | 2,279 |
Additions charged to operations |  |  | 6,261 |  |  |  | 2,642 |
Deductions from liability |  |  | (5,457 | ) |  |  | (3,396 | )
Warranty liability at end of period |  | $ | 2,329 |  |  | $ | 1,525 |

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