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2302302 - Disclosure - Summary of Significant Accounting Policies (Tables)
(http://www.formfactor.com/role/SummaryOfSignificantAccountingPoliciesTables)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001039399 (http://www.sec.gov/CIK)
Accounting Policies [Abstract]Period [Axis]
2015-12-27 - 2016-12-31
Accounting Policies [Abstract]
 
Schedules of Concentration of Risk, by Customer
The following customers represented greater than 10% of our revenues in fiscal 2016, fiscal 2015 and fiscal 2014:
 
Fiscal 2016
 
Fiscal 2015
 
Fiscal 2014
Intel
30.1
%
 
19.6
%
 
19.7
%
Samsung
*

 
14.6

 
*

SK hynix
*

 
14.3

 
16.9

Micron
*

 
11.7

 
15.0

Total revenues attributable to customers greater than 10%
30.1
%
 
60.2
%
 
51.6
%
* Less than 10% of revenues
  
Schedule of Product Warranty Liability Reconciliation
A reconciliation of the changes in our warranty liability is as follows (in thousands):
 
Fiscal Years Ended
 
December 31, 2016
 
December 26, 2015
Balance at beginning of year
$
1,116

 
$
1,592

Warranty reserve from acquisition-Cascade Microtech
795

 
—

Accruals
5,254

 
2,536

Settlements
(4,193
)
 
(3,012
)
Balance at end of year
$
2,972

 
$
1,116

  
Schedule of Allowance for Doubtful Accounts
The allowance for doubtful accounts receivable consisted of the following activity for fiscal years 2016, 2015 and 2014 (in thousands):
 
Balance at Beginning of Year
 
Additions
 
Reductions
 
Balance at End of Year
Fiscal year ended December 27, 2014
$
265

 
$
5

 
$
(4
)
 
$
266

Fiscal year ended December 26, 2015
266

 
20

 
(2
)
 
284

Fiscal year ended December 31, 2016
$
284

 
$
62

 
$
(48
)
 
$
298

  
Schedule of Calculation of Numerator and Denominator in Earnings Per Share
A reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share is as follows (in thousands):
 
Fiscal Years Ended
 
December 31, 2016
 
December 26, 2015
 
December 27, 2014
Numerator:
 
 
 
 
 
Net loss used in computing basic and diluted net loss per share
$
(6,557
)
 
$
(1,523
)
 
$
(19,185
)
Denominator:
 
 
 
 
 
Weighted-average shares used in computing basic net loss per share
64,941

 
57,850

 
55,908

Add potentially dilutive securities
—

 
—

 
—

Weighted-average shares used in computing basic and diluted net loss per share
64,941

 
57,850

 
55,908

  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following securities were excluded from the calculation of diluted net loss per share because their effect would have been anti-dilutive for the periods presented (in thousands):
 
Fiscal Years Ended
 
December 31, 2016
 
December 26, 2015
 
December 27, 2014
Options to purchase common stock
2,198

 
2,320

 
2,874

Restricted stock units
3,113

 
2,578

 
—

Employee stock purchase plan
10

 
8

 
28

Total potentially dilutive securities
5,321

 
4,906

 
2,902

  
Schedule of Accumulated Other Comprehensive Loss
Accumulated other comprehensive loss includes foreign currency translation adjustments, unrealized gains on derivative instruments and unrealized losses on available-for-sale securities, net of tax, the impact of which has been excluded from earnings and reflected as components of stockholders' equity as shown below (in thousands):
 
 
December 31, 2016
 
December 26, 2015
Unrealized loss on marketable securities, net of tax of $364 in fiscal 2016 and $428 in fiscal 2015, respectively
 
$
(454
)
 
$
(483
)
Cumulative translation adjustments
 
(3,781
)
 
(1,739
)
Unrealized gains on derivative instruments
 
495

 
—

Accumulated other comprehensive loss
 
$
(3,740
)
 
$
(2,222
)