Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.

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The cash inflow associated with the amount received from entity's first offering of stock to the public.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Number of new stock issued during the period.

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Description of Business Description of Business (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Sep. 30, 2013	Sep. 30, 2012	Jun. 12, 2013	Sep. 20, 2013
Description of Business [Line Items]
Accumulated deficit	$ (184,733)	$ (209,419)
Aggregate offering price, net of issuance costs	0	0	138,613	0
Common Stock, Shares, Issued	25,247,000us-gaap_CommonStockSharesIssued	26,247,000us-gaap_CommonStockSharesIssued
IPO [Member]
Description of Business [Line Items]
Shares of stock issued					750,000
Follow on Public Offering [Member]
Description of Business [Line Items]
Aggregate offering price, net of issuance costs						61,221
Common Stock [Member] \| IPO [Member]
Description of Business [Line Items]
Shares of stock issued					5,750,000
Aggregate offering price, net of issuance costs					80,213
Underwriting discounts and commissions					(6,037)
Deferred offering costs					(2,504)
Common Stock [Member] \| Follow on Public Offering [Member]
Description of Business [Line Items]
Shares of stock issued						1,687,000
Underwriting discounts and commissions						(2,885)
Deferred offering costs						$ (1,442)