Redeemable Convertible Preferred Shares (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Oct. 01, 2014	Dec. 31, 2014	Nov. 10, 2014	Dec. 31, 2013
Temporary Equity [Line Items]
Conversion Basis for Redeemable Convertible Preferred Shares		Each Series A, Series B, and Series E preferred share were initially convertible at any time at the option of the holder into common shares on a 1:1 basis, subject to certain adjustments for share splits, consolidations, stock dividends, and, as applicable, following certain capital reorganizations or mergers or acquisitions with another company as well as certain adjustments based on whether any common shares were issued during certain specified time periods at a price per share which was lower than certain threshold amounts as set forth in the articles.
Stockholders' Equity Note, Stock Split, Conversion Ratio	4.86
Preferred Shares Outstanding				6,468,479
Preferred Stock, Shares Outstanding			0
Series A Preferred Stock [Member]
Temporary Equity [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio		1
Convertible Preferred Stock, Shares Issued upon Conversion		Converted into common shares on a 1:1 basis
Preferred Shares Outstanding		0		1,151,468
Preferred Stock, Dividend Rate		8.00%
Dividends Declared Prior to Conversion		0
Preferred Stock, Shares Authorized		0		1,205,761
Preferred Stock, Shares Outstanding		0		1,151,468
Series B Preferred Stock [Member]
Temporary Equity [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio		1
Convertible Preferred Stock, Shares Issued upon Conversion		Converted into common shares on a 1:1 basis
Preferred Shares Outstanding		0		994,885
Preferred Stock, Dividend Rate		8.00%
Dividends Declared Prior to Conversion		0
Preferred Stock, Shares Authorized		0		1,028,806
Preferred Stock, Shares Outstanding		0		994,885
Series E Preferred Stock [Member]
Temporary Equity [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio		1
Convertible Preferred Stock, Shares Issued upon Conversion		Converted into common shares on a 1: 1.2 basis
Preferred Shares Outstanding		0		4,322,126
Preferred Stock, Dividend Rate		8.00%
Dividends Declared Prior to Conversion		0
Preferred Stock, Shares Authorized		0		4,370,920
Preferred Stock, Shares Outstanding		0		4,322,126
Series C Preferred Stock [Member]
Temporary Equity [Line Items]
Preferred Stock, Shares Authorized		4,620
Preferred Stock, Shares Outstanding		0		0
Series D Preferred Stock [Member]
Temporary Equity [Line Items]
Preferred Stock, Shares Authorized		9,376
Preferred Stock, Shares Outstanding		0		0