Consolidated Statements of Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (4,639)	$ (1,636)	$ (12,713)	$ (6,427)
Other comprehensive income:
Unrealized gains on derivative instruments	69		47
Total other comprehensive income	69		47
Comprehensive loss	$ (4,570)	$ (1,636)	$ (12,666)	$ (6,427)