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Investments | 9 Months Ended
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Oct. 28, 2018
Investments [Abstract] |
Investments | Investments The following table summarizes the Company’s available-for-sale securities:
| October 28, 2018 |  | January 28, 2018
(in thousands) | Market Value |  | Adjusted Cost |  | Gross Unrealized Gain |  | Market Value |  | Adjusted Cost |  | Gross Unrealized Gain
Convertible debt | $ | 3,105 |  |  | $ | 3,105 |  |  | $ | — |  |  | $ | 1,960 |  |  | $ | 1,960 |  |  | $ | — |
Total other assets | $ | 3,105 |  |  | $ | 3,105 |  |  | $ | — |  |  | $ | 1,960 |  |  | $ | 1,960 |  |  | $ | — |
The following table summarizes the maturities of the Company’s available-for-sale securities:
| October 28, 2018 |  | January 28, 2018
(in thousands) | Market Value |  | Adjusted Cost |  | Market Value |  | Adjusted Cost
Within 1 year | $ | 2,000 |  |  | $ | 2,000 |  |  | $ | 1,960 |  |  | $ | 1,960 |
After 1 year through 5 years | 1,105 |  |  | 1,105 |  |  | — |  |  | — |
Total investments | $ | 3,105 |  |  | $ | 3,105 |  |  | $ | 1,960 |  |  | $ | 1,960 |
The Company's available-for-sales securities consisted of investments in convertible debt instruments issued by privately-held companies and is included in "Other current assets" in the Balance Sheets. The Company currently has an investment in Multiphy Ltd. ("Multiphy") that is accounted for at cost and included in "Other assets" in the Balance Sheets. During the third quarter of fiscal year 2019, the Company reduced its expectation of Multiphy's future operating performance due to new information that became available during the quarter. The Company concluded that the competitive landscape had evolved and that product release and broad market adoption of 400G PAM4 digital signal processing (DSP) technology is delayed. As a result of these indicators of impairment, the Company tested the investment for an other-than-temporary impairment using a discounted cash flow model. The results of its analysis indicated that the investment was other-than temporarily impaired by $30.0 million, representing the entire carrying value of the investment.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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