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401(k) savings plan (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
Savings Plan - 401(k) [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Contributions to 401(k) | $ 53 | $ 48 | $ 43 |