Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2014

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Results

Summary quarterly results for the two years ended December 31, 2014 are as follows (in thousands, other than share and per share data):

	Three Months Ended
2014	March 31			June 30			September 30			December 31			Full Year
Revenue	$	14,268		$	14,469		$	8,036		$	8,912		$	45,685
Gross loss	$	(7,494	)	$	(7,274	)	$	(9,460	)	$	(5,459	)	$	(29,687	)
Loss from operations	$	(10,925	)	$	(10,179	)	$	(13,872	)	$	(8,637	)	$	(43,613	)
Loss before income taxes	$	(10,888	)	$	(9,984	)	$	(14,011	)	$	(9,032	)	$	(43,915	)
Net loss	$	(10,894	)	$	(9,984	)	$	(13,713	)	$	(9,402	)	$	(43,993	)
Basic and diluted loss per common share	$	(0.43	)	$	(0.39	)	$	(0.53	)	$	(0.36	)	$	(1.70	)
Weighted average common shares outstanding used in computing net loss per common share, basic and diluted:		25,317,147			25,706,797			26,110,651			26,127,026			25,815,405

	Three Months Ended
2013	March 31			June 30			September 30			December 31			Full Year
Revenue	$	8,307		$	10,555		$	11,115		$	11,536		$	41,513
Gross loss	$	(3,375	)	$	(6,417	)	$	(6,318	)	$	(5,811	)	$	(21,921	)
Loss from operations	$	(6,296	)	$	(9,968	)	$	(9,595	)	$	(9,025	)	$	(34,884	)
Loss before income taxes	$	(6,418	)	$	(10,173	)	$	(9,814	)	$	(9,106	)	$	(35,511	)
Net loss	$	(3,376	)	$	(5,894	)	$	(5,840	)	$	(15,241	)	$	(30,351	)
Basic and diluted loss per common share	$	(0.15	)	$	(0.26	)	$	(0.26	)	$	(0.67	)	$	(1.35	)
Weighted average common shares outstanding used in computing net loss per common share, basic and diluted:		22,550,378			22,560,603			22,578,608			22,599,258			22,572,212