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2302302 - Disclosure - Summary of Significant Accounting Policies (Tables)
(http://www.irobot.com/role/SummaryOfSignificantAccountingPoliciesTables)
TableValuation and Qualifying Accounts Disclosure [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001159167 (http://www.sec.gov/CIK)
Valuation Allowances and Reserves Type [Axis]Valuation Allowances and Reserves [Domain]
Valuation and Qualifying Accounts Disclosure [Line Items]Period [Axis]
2016-01-03 - 2016-12-31
Components of available for sale securities
The fair value of investments is determined based on quoted market prices at the reporting date for those instruments. As of December 31, 2016 and January 2, 2016, investments consisted of:
 
December 31,
2016
 
January 2,
2016
 
Cost
 
Fair
Market Value
 
Cost
 
Fair
Market Value
 
(In thousands)
Corporate and government bonds
$
40,439

 
$
39,930

 
$
33,622

 
$
33,124

Total short term investments
$
40,439

 
$
39,930

 
$
33,622

 
$
33,124

  
Activity related to allowance for doubtful accounts
Activity related to the allowance for doubtful accounts was as follows:
 
Fiscal Year Ended
 
December 31,
2016
 
January 2,
2016
 
December 27,
2014
 
(In thousands)
Balance at beginning of period
$
33

 
$
67

 
$
67

Provision
—

 
—

 
—

Deduction(*)
(4
)
 
(34
)
 
—

Balance at end of period
$
29

 
$
33

 
$
67


___________________________   
(*)
Deductions related to allowance for doubtful accounts represent amounts written off against the allowance, less recoveries.
  
Activity related to Inventory reserve
The table below summarizes activity relating to the valuation allowance:
Fiscal Year Ended
Balance at
beginning  of
period
 
Additions
Charged to
Costs and
Expenses
 
Additions Charged to Goodwill
 
Deductions
 
Balance
at End
of Period
 
(In thousands)
December 27, 2014
$
2,090

 
—

 
—

 
2,090

 
$
—

January 2, 2016
$
—

 
—

 
—

 


 
$
—

December 31, 2016
$
—

 
—

 
—

 
—

 
$
—

  
Property and equipment
Depreciation is computed using the straight-line method over the estimated useful lives as follows:
 
Estimated Useful Life
Computer and research equipment
2-5 years

Furniture
5

Machinery
2-5

Tooling
2-5

Business applications software
5-7

Capital leases and leasehold improvements
Lesser of economic benefit period or term of lease

Property and equipment consists of the following at:
 
December 31,
2016
 
January 2,
2016
 
(In thousands)
Computer and equipment
$
7,378

 
$
13,825

Furniture
2,906

 
2,441

Machinery
9,154

 
7,134

Tooling
20,487

 
16,599

Leasehold improvements
21,383

 
21,022

Business applications software
9,471

 
8,559

 
70,779

 
69,580

Less: accumulated depreciation
43,247

 
42,730

 
$
27,532

 
$
26,850

  
Basic and diluted net income per share
The following table presents the calculation of both basic and diluted net income per share:
 
Fiscal Year Ended
 
December 31,
2016
 
January 2,
2016
 
December 27,
2014
Net income
$
41,939

 
$
44,130

 
$
37,803

Weighted-average shares outstanding
27,698

 
29,550

 
29,485

Dilutive effect of employee stock options and restricted shares
594

 
557

 
725

Diluted weighted-average shares outstanding
28,292

 
30,107

 
30,210

Basic income per share
$
1.51

 
$
1.49

 
$
1.28

Diluted income per share
$
1.48

 
$
1.47

 
$
1.25