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Summary of Significant Accounting Policies - Allowance For Doubtful Accounts Rollforward (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts receivable [Roll Forward]
Beginning balance	$ 929	$ 623	$ 592
Additions to sales allowance and bad debt expense	1,305	536	276
Deductions (write-offs/recoveries) from reserve	(529)	(230)	(245)
Ending balance	$ 1,705	$ 929	$ 623

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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