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Stockholders' Equity - Additional Information (Detail) (IPO [Member], USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	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