Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, except Share data	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive (Loss) Income [Member]	Total
Balance at Dec. 31, 2010	$ 229	$ 281,791	$ (145,271)	$ (3,882)	$ 132,867
Shares, Outstanding, Beginning Balance at Dec. 31, 2010	22,900,253
Loss on currency translation adjustments				(1,984)	(1,984)
Share-based compensation expense		6,369			6,369
APIC pool adjustment		(344)			(344)
Stock options exercised	7	8,920			8,927
Stock options exercised, shares	719,052
Issuance of restricted shares	7,104
Vested restricted stock units converted to shares, shares	24,450
Employee stock purchase plan		545			545
Employee stock purchase plan, shares	23,417
(Income) loss allocated to noncontrolling interests			(234)		(234)
Accretion associated with noncontrolling interest (variable interest entity)		(3,159)			(3,159)
Public stock offering, net	35	91,389			91,424
Shares from public offering	3,450,000
Net loss			(3,871)		(3,871)
Balance at Dec. 31, 2011	271	385,511	(149,376)	(5,866)	230,540
Shares, Outstanding, Ending Balance at Dec. 31, 2011	27,124,276
Loss on currency translation adjustments				(995)	(995)
Share-based compensation expense		4,350			4,350
APIC pool adjustment		(2,197)			(2,197)
Stock options exercised	2	2,990			2,992
Stock options exercised, shares	197,320				197,320
Issuance of restricted shares	6,036
Vested restricted stock units converted to shares	1	(1)
Vested restricted stock units converted to shares, shares	50,206
Restricted shares withheld for payroll tax payments		(76)			(76)
Restricted shares withheld for payroll tax payments, shares	(2,627)
Employee stock purchase plan		339			339
Employee stock purchase plan, shares	12,504
(Income) loss allocated to noncontrolling interests			184		184
Net loss			(4,362)		(4,362)
Balance at Jun. 30, 2012	$ 274	$ 390,916	$ (153,554)	$ (6,861)	$ 230,775
Shares, Outstanding, Ending Balance at Jun. 30, 2012	27,387,715