Consolidated Statements of Redeemable Convertible Preferred Shares and Shareholders' Equity (Deficit) In Thousands, except Share data	Total USD ($)	Initial public offering USD ($)	Conversion of redeemable convertible preferred shares USD ($)	Secondary Public Offering USD ($)	Employee Stock Purchase Plans USD ($)	Series A, B and C Redeemable Convertible Preferred Shares USD ($)	Series A, B and C Redeemable Convertible Preferred Shares Conversion of redeemable convertible preferred shares USD ($)	Ordinary Shares USD ($)	Ordinary Shares Initial public offering USD ($)	Ordinary Shares Conversion of redeemable convertible preferred shares USD ($)	Ordinary Shares Secondary Public Offering USD ($)	Ordinary Shares Employee Stock Purchase Plans	Deferred Shares USD ($)	Deferred Shares	Additional Paid-In Capital USD ($)	Additional Paid-In Capital Initial public offering USD ($)	Additional Paid-In Capital Conversion of redeemable convertible preferred shares USD ($)	Additional Paid-In Capital Secondary Public Offering USD ($)	Additional Paid-In Capital Employee Stock Purchase Plans USD ($)	Note Receivable from Officer USD ($)	Accumulated Other Comprehensive Income (loss) USD ($)	Accumulated Deficit USD ($)
Balances at Dec. 31, 2010	$ (115,514)					$ 130,393		$ 20					$ 29		$ 171					$ (143)	$ 969	$ (116,560)
Balances (in shares) at Dec. 31, 2010						34,634,734		1,497,150					2,230,330
Share-based compensation	2,292														2,292
Accretion of redeemable convertible preferred shares to redemption value	(446)					446									(446)
Accrued interest income and foreign currency adjustment on note receivable from officer	(9)																			(9)
Collection of note receivable from officer	152																			152
Foreign currency translation adjustments, net of tax	(409)																				(409)
Net income	2,869																					2,869
Balances at Dec. 31, 2011	(111,065)					130,839		20					29		2,017						560	(113,691)
Balances (in shares) at Dec. 31, 2011						34,634,734		1,497,150					2,230,330
Share-based compensation	2,422														2,422
Accretion of redeemable convertible preferred shares to redemption value	(335)					335									(335)
Exercises of stock options for ordinary shares (in shares)								184,335
Exercises of stock options for ordinary shares	305							4							301
Excess tax benefits from share-based awards	(266)														(266)
Issuance of shares upon conversion of convertible securities (in shares)							(34,634,734)			26,653,383
Issuance of shares upon conversion of convertible securities			131,174				(131,174)			515							130,659
Issuance of shares		93,313							121							93,192
Issuance of shares (in shares)									6,250,000				4
Foreign currency translation adjustments, net of tax	66																				66
Net income	5,408																					5,408
Balances at Dec. 31, 2012	121,022							660					29		227,990						626	(108,283)
Balances (in shares) at Dec. 31, 2012								34,584,868					2,230,334
Share-based compensation	7,470														7,470
Exercises of stock options for ordinary shares (in shares)								1,424,273
Exercises of stock options for ordinary shares	5,517							29							5,488
Excess tax benefits from share-based awards	3,813														3,813
Issuance of shares				32,060	283						20							32,040	283
Issuance of shares (in shares)											1,000,000	14,640
Foreign currency translation adjustments, net of tax	1,186																				1,186
Net income	30,457																					30,457
Balances at Dec. 31, 2013	$ 201,808							$ 709					$ 29		$ 277,084						$ 1,812	$ (77,826)
Balances (in shares) at Dec. 31, 2013								37,023,781					2,230,334