Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Accounting Policies [Abstract]  
Property and equipment
The components of property and equipment consist of the following as of December 31, (in thousands):
 
2012
 
2013
Machinery and equipment
14,810

 
16,628

Furniture, fixtures, and computer software
1,159

 
1,669

Leasehold improvements
1,926

 
2,578

Construction in progress
909

 
831

Total property and equipment, at cost
18,804

 
21,706

Less accumulated depreciation
(11,657
)
 
(14,141
)
Property and equipment, net
7,147

 
7,565
Net revenue by major customer
Net revenue by major customer is as follows (as a percentage of total net revenue):
 
2011
 
2012
 
2013
HP
74
%
 
68
%
 
59
%
Tektronix
6
%
 
10
%
 
13
%
Other customers less than 10%
20
%
 
22
%
 
28
%
Total
100
%
 
100
%
 
100
%
Allowance for doubtful accounts
Balance sheet details are as follows, (in thousands):
 
December 31,
2012
 
December 31,
2013
Balance, beginning of the year
$
203

 
$
240

Write offs
—

 
(219
)
Additions to allowance
37

 
2

Balance, end of the year
$
240

 
$
23