Significant Accounting Policies - Secondary Offering (Details)	12 Months Ended
	Dec. 31, 2014 USD ($) shares
January 2014 [Member]
Secondary Offering Period	January 23, 2014
Stock Issued During Secondary Offering	1,800,000
Underwriters Overallotment Period	January 29, 2014
Underwriters Overallotment Shares	270,000
Proceeds From Secondary Offering | $	$ 24,200,000
March 2014 [Member]
Secondary Offering Period	March 24, 2014
Stock Issued During Secondary Offering	3,200,000
Underwriters Overallotment Period	April 11, 2014
Underwriters Overallotment Shares	480,000
Proceeds From Secondary Offering | $	$ 44,000,000