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Stockholders' Equity - Additional Information (Detail) (IPO [Member], USD $) In Millions, except Share data, unless otherwise specified | 1 Months Ended
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Sep. 23, 2013
Subsidiary, Sale of Stock [Line Items] |
Net proceeds from the sale of shares, after offering expenses | $ 69.5
Common stock [Member] |
Subsidiary, Sale of Stock [Line Items] |
Sale of stock, number of shares issued in transaction | 7,015,000
Sale of stock, price per share | $ 10.58
Underwriters [Member] | Common stock [Member] |
Subsidiary, Sale of Stock [Line Items] |
Sale of stock, number of shares issued in transaction | 915,000

X
- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration