Organization and Summary of Significant Accounting Policies - Initial Public Offering (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Jan. 30, 2014	Mar. 31, 2014	Jun. 30, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Net proceeds from issuance of common stock, net of underwriting discount, offering expenses and repurchase or shares		$ 75.8
Common stock, shares outstanding			16,516,546	16,448,750
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares outstanding	16,448,750
Common Stock [Member] | IPO [Member]
Class of Stock [Line Items]
Conversion of members' equity into common stock, shares	8,636,250
Issuance of common stock, net of issuance costs, shares	8,984,375
Share Price (in dollars per share)	$ 11.00
Repurchase of common stock, shares		1,171,875
Common Stock [Member] | Over-Allotment Option [Member]
Class of Stock [Line Items]
Issuance of common stock, net of issuance costs, shares	1,171,875