Quarterly Financial Results (unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

Three Months Ended:	Revenue		Gross Profit		Operating expenses		Net loss			Basic loss per share			Diluted loss per share
December 31, 2013	$	35,249	$	26,077	$	27,217	$	(3,412	)	$	(0.05	)	$	(0.05	)
September 30, 2013	33,260		25,898		28,116		(8,990		)	(0.14		)	(0.14		)
June 30, 2013	33,964		25,004		27,524		5,670			0.09			0.09
March 31, 2013	29,784		22,528		27,018		(9,335		)	(0.16		)	(0.16		)
Three Months Ended:
December 31, 2012 (a)	$	29,222	$	22,064	$	27,761	$	(6,518	)	$	(0.10	)	$	(0.10	)
September 30, 2012	26,696		20,252		27,185		(5,857		)	(0.10		)	(0.10		)
June 30, 2012	25,509		19,232		24,819		(6,696		)	(0.11		)	(0.11		)
March 31, 2012	24,519		19,116		22,790		(16,703		)	(0.29		)	(0.29		)