Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net loss attributable to common stockholders	$ (25,913)	$ (38,218)	$ (32,290)
Other comprehensive income (loss):
Foreign currency translation adjustments	177	(31)	83
Other comprehensive income (loss):	177	(31)	83
Comprehensive loss attributable to common stockholders	$ (25,736)	$ (38,249)	$ (32,207)