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Description of Business and Summary of Significant Accounting Policies (Details) (USD $)
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0 Months Ended | 9 Months Ended | |
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Aug. 07, 2013
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Jul. 18, 2013
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Sep. 30, 2013
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| IPO | |||
| Common stock sold and issued in IPO (in shares) | 4,600,000 | ||
| Common stock price (in dollars per share) | $ 16.00 | ||
| Gross proceeds from the IPO | $ 73,600,000 | ||
| Net proceeds from IPO | 65,600,000 | 65,556,000 | |
| Underwriting discounts and commissions | 5,200,000 | ||
| Offering expenses | $ 2,800,000 | ||
| Stock Split | |||
| Reverse stock split of outstanding common stock | 0.1923 | ||
| Segment Reporting | |||
| Number of operating segments | 1 | ||
| Concentrations of Risk | |||
| Number of high-credit-quality financial institutions with which cash and cash equivalents are deposited | 1 | ||