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401(k) Savings Plan - Additional Information (Detail) (USD $)
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12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| Schedule of Postemployment Benefits [Line Items] | |||
| Cash Contributions | $ 276,000 | $ 186,000 | $ 67,000 |