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Valuation and Qualifying Accounts - Valuation and Qualifying Accounts (Detail) (Allowance for Doubtful Accounts [Member], USD $)
In Thousands, unless otherwise specified |
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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Allowance for Doubtful Accounts [Member]
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| Valuation and Qualifying Accounts Disclosure [Line Items] | |||
| Balance, beginning of year | $ 373 | $ 339 | $ 97 |
| Additions charged to operations | 34 | 242 | |
| Deletions from Reserve | 278 | ||
| Balance, end of year | $ 95 | $ 373 | $ 339 |