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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Property and equipment
The components of property and equipment consist of the following, (in thousands):
 
December 31,
 
2013
 
2014
Machinery and equipment
$
16,628

 
$
19,263

Furniture, fixtures, and computer software
1,669

 
2,072

Leasehold improvements
2,578

 
2,620

Construction in progress
831

 
228

Total property and equipment, at cost
21,706

 
24,183

Less accumulated depreciation
(14,141
)
 
(15,419
)
Property and equipment, net
$
7,565

 
$
8,764
Net revenue by major customer
Net revenue by major customer is as follows (as a percentage of total net revenue):
 
Year Ended December 31,
 
2012
 
2013
 
2014
Customer A
68
%
 
59
%
 
47
%
Customer B
—
%
 
0
%
 
11
%
Customer C
10
%
 
13
%
 
8
%
Other customers less than 10%
22
%
 
28
%
 
34
%
Total
100
%
 
100
%
 
100
%
Schedule of Goodwill [Table Text Block]
The changes in the carrying amount of goodwill are as follows during the years ended December 31, 2013 and 2014 (in thousands):
 
December 31,
 
2013
 
2014
Balance, beginning of the year

 
 
Goodwill
$
44,840

 
$
44,840

Accumulated impairment losses
(44,840
)
 
(44,840
)
 
—

 
—

Balance, end of the year
 
 
 
Goodwill
44,840

 
44,840

Accumulated impairment losses
(44,840
)
 
(44,840
)
 
$
—

 
$
—
Allowance for doubtful accounts
 
December 31,
 
2013
 
2014
Balance, beginning of the year
$
240

 
$
23

Write offs
(219
)
 
—

Additions to allowance
2

 
64

Balance, end of the year
$
23

 
$
87