XML 34 R30.htm IDEA: XBRL DOCUMENT
v3.2.0.727

Stockholders' Equity and Stock-Based Compensation (Tables) | 6 Months Ended
--- | ---
Jun. 27, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock options valuation assumptions |
| Three Months Ended |  | Six Months Ended
| June 27, 2015 |  | June 28, 2014 |  | June 27, 2015 |  | June 28, 2014
Stock Options: |  |  |  |  |  |  |
Expected life | — |  |  | 4.6 years |  | — |  |  | 4.6 years
Volatility | — |  |  | 52.0% |  | — |  |  | 54.9%
Risk free interest rate | — |  |  | 1.56% |  | — |  |  | 1.54%
Dividends | — |  |  | — |  | — |  |  | —
Employee Stock Purchase Plan: |  |  |  |  |  |  |
Expected life | 0.5 years |  | 0.5 years |  | 0.5 years |  | 0.5 years
Volatility | 37.2% |  | 32.6% |  | 37.2% |  | 32.6%
Risk free interest rate | 0.11% |  | 1.00% |  | 0.11% |  | 1.00%
Dividends | — |  | — |  | — |  | —
Employee stock purchase plan valuation assumptions |
| Three Months Ended |  | Six Months Ended
| June 27, 2015 |  | June 28, 2014 |  | June 27, 2015 |  | June 28, 2014
Stock Options: |  |  |  |  |  |  |
Expected life | — |  |  | 4.6 years |  | — |  |  | 4.6 years
Volatility | — |  |  | 52.0% |  | — |  |  | 54.9%
Risk free interest rate | — |  |  | 1.56% |  | — |  |  | 1.54%
Dividends | — |  |  | — |  | — |  |  | —
Employee Stock Purchase Plan: |  |  |  |  |  |  |
Expected life | 0.5 years |  | 0.5 years |  | 0.5 years |  | 0.5 years
Volatility | 37.2% |  | 32.6% |  | 37.2% |  | 32.6%
Risk free interest rate | 0.11% |  | 1.00% |  | 0.11% |  | 1.00%
Dividends | — |  | — |  | — |  | —
Stock option plans activity | A summary of activity of stock options during the six months ended June 27, 2015 is as follows:
| Number of Shares Outstanding (Options) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value (in Thousands)
Options |  |  |  |  |  |  |
Outstanding at December 27, 2014 | 1,382,993 |  |  | $ | 13.92 |  |  | 3.41 |  | $ | 4,108 |
Exercised | (152,882 | ) |  | 10.82 |  |  |  |  |
Cancelled | (30,790 | ) |  | 16.08 |  |  |  |  |
Outstanding at June 27, 2015 | 1,199,321 |  |  | $ | 14.27 |  |  | 2.90 |  | $ | 3,227 |
Exercisable at June 27, 2015 | 997,952 |  |  | $ | 13.86 |  |  | 2.48 |  | $ | 3,062 |
Summary of activity for RSUs | A summary of activity for RSUs is as follows:
RSUs | Number of RSUs |  | Weighted Average Fair Value
Outstanding RSUs as of December 27, 2014 | 563,337 |  |  | $ | 17.90 |
Granted | 365,539 |  |  | 16.04 |
Released | (203,429 | ) |  | 17.01 |
Cancelled | (47,592 | ) |  | 17.31 |
Outstanding RSUs as of June 27, 2015 | 677,855 |  |  | $ | 17.21 |
PSUs valuation assumptions | The assumptions for the valuation of PSUs are summarized as follows:
| 2015 Award
Number of PSUs granted and outstanding as of June 27, 2015 | 40,000 |
Grant Date Fair Value Per Share | $ | 18.35 |
Weighted-average assumptions/inputs: |
Expected Dividend | —
Range of risk-free interest rates | 0.25%-1.1%
Range of expected volatilities for peer group | 23%-65%
Stock-based compensation expense for all share-based payment awards | Stock-based compensation expense for all share-based payment awards made to the Company’s employees and directors pursuant to the employee stock option and employee stock purchase plans by function were as follows (in thousands):
| For the Three Months Ended |  | For the Six Months Ended
| June 27, 2015 |  | June 28, 2014 |  | June 27, 2015 |  | June 28, 2014
Cost of products | $ | 60 |  |  | $ | 68 |  |  | $ | 132 |  |  | $ | 129 |
Cost of service | 45 |  |  | 89 |  |  | 91 |  |  | 174 |
Research and development | 215 |  |  | 296 |  |  | 496 |  |  | 636 |
Selling | 393 |  |  | 437 |  |  | 892 |  |  | 863 |
General and administrative | 698 |  |  | 886 |  |  | 1,371 |  |  | 1,608 |
Total stock-based compensation expense | $ | 1,411 |  |  | $ | 1,776 |  |  | $ | 2,982 |  |  | $ | 3,410 |

X
- Definition Schedule of Share-based Payment Award, Equity Instruments Other Than Stock Options, Valuation Assumptions [Table Text Block] + References No definition available. + Details
Name: | nano_ScheduleofSharebasedPaymentAwardEquityInstrumentsOtherThanStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | nano_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfNonvestedRestrictedStockUnitsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration