Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Accounts, Notes, Loans and Financing Receivable
Allowance for doubtful accounts are as follows (in thousands):
 
Balance at Beginning of Period
 
Additions Charged to Revenues
 
Deductions (1)
 
Balance at End of Period
Allowance for doubtful accounts:
 
 
 
 
 
 
 
2013
$
170

 
$
—

 
$
(170
)
 
$
—

2012
$
—

 
$
170

 
$
—

 
$
170

2011
$
—

 
$
—

 
$
—

 
$
—


(1) Deductions related to the allowance for doubtful accounts written off against the allowance and recoveries.
Schedule of significant customer, including related parties, revneue as a percentage of total revenue and accounts receivable as a percentage of total accounts receivable
For each significant customer, including related parties, revenue as a percentage of total revenue and accounts receivable as a percentage of total accounts receivable are as follows:
 
Revenue
 
Accounts Receivable
 
Years Ended
 
As of
 
As of 
 
December 31,
 
December 31,
 
December 31,
 
2013
 
2012
 
2011
 
2013
 
2012
Customer A
13
%
 
25
%
 
29
%
 
*

 
*

Customer B
17
%
 
28
%
 
17
%
 
13
%
 
25
%
Customer C (1)
*

 
14
%
 
18
%
 
—
%
 
*

Customer D
*

 
*

 
*

 
15
%
 
12
%
Customer E
12
%
 
*

 
—
%
 
14
%
 
40
%
Customer F (1)
13
%
 
—
%
 
—
%
 
41
%
 
—
%
 
 
*  less than 10%
(1) Customer C was acquired by Customer F as of July 31, 2013. Revenue and accounts receivable attributed to Customers C and F are combined under Customer F for periods after July 31, 2013.