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Summary of Significant Accounting Policies Activity Related to Allowance for Doubtful Accounts (Details) (Allowance for doubtful accounts, USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Allowance for doubtful accounts
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| Valuation Allowance [Line Items] | |||
| Balance at the beginning of the period | $ 307 | $ 135 | $ 21 |
| Bad debt expense | 789 | 321 | 133 |
| Accounts written off | (291) | (149) | (19) |
| Balance at the end of the period | $ 805 | $ 307 | $ 135 |