Condensed Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Net loss	$ (9,262)	$ (2,309)	$ (31,489)	$ (15,318)
Other comprehensive income (loss):
Foreign currency translation adjustments	0	0	0	165
Unrealized gain (loss) on marketable securities, net of tax of $17 and $172 for the three and nine months ended September 30, 2013, and $58 and $58 for the three and nine months ended September 30, 2012	32	724	275	88
Other comprehensive income	32	724	275	253
Total comprehensive loss	$ (9,230)	$ (1,585)	$ (31,214)	$ (15,065)