Concentration of Credit Risk (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Concentration Risk [Line Items]
Industry practice payment of receivables	20 days
Percentage of US demand supplied by company (in hundredths)	1.00%
Allowance for doubtful accounts	$ 252	$ 206
Changes in the allowance for doubtful accounts [Roll Forward]
Balance, beginning of year	206	357	180
Provisions for bad debts	147	0	276
Less: Write-offs and recoveries	(101)	(151)	(99)
Balance, end of year	$ 252	$ 206	$ 357
Customer Concentration Risk [Member] | Minimum [Member]
Concentration Risk [Line Items]
Number of customers	3
Customer Concentration Risk [Member] | Maximum [Member]
Concentration Risk [Line Items]
Number of customers	4
Accounts Receivable [Member]
Concentration Risk [Line Items]
Number of customers	3	3	2
Accounts Receivable [Member] | Product Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	90.00%
Accounts Receivable [Member] | Customer One [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	16.00%	22.10%	24.50%
Accounts Receivable [Member] | Customer Two [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	15.80%	21.40%	21.50%
Accounts Receivable [Member] | Customer Three [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	12.70%	11.40%
Revenue [Member]
Concentration Risk [Line Items]
Number of customers	4	3	4
Revenue [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	50.00%
Revenue [Member] | Customer One [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	18.50%	20.20%	18.20%
Revenue [Member] | Customer Two [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	17.70%	17.90%	15.40%
Revenue [Member] | Customer Three [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	15.80%	16.80%	13.40%
Revenue [Member] | Customer Four [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	10.40%		11.30%