Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Summary of Quarterly Results

Summary quarterly results for the two years ended December 31, 2015 are as follows (in thousands, other than share and per share data):

	Three Months Ended												Full Year
2015	March 31			June 30			September 30			December 31
Revenue	$	8,910		$	7,106		$	5,346		$	2,456		$	23,818
Gross loss	$	(5,109	)	$	(5,155	)	$	(3,891	)	$	(8,988	)	$	(23,143	)
Loss from operations	$	(7,948	)	$	(8,322	)	$	(47,370	)	$	(12,309	)	$	(75,949	)
Loss before income taxes	$	(8,312	)	$	(8,529	)	$	(48,859	)	$	(12,156	)	$	(77,856	)
Net loss	$	(8,348	)	$	(8,580	)	$	(48,196	)	$	(12,706	)	$	(77,830	)
Basic and diluted loss per common share	$	(0.32	)	$	(0.33	)	$	(1.84	)	$	(0.49	)	$	(2.98	)
Weighted average common shares outstanding used in computing net loss per common share, basic and diluted:		26,129,276			26,142,261			26,160,308			26,192,838			26,156,170
	Three Months Ended												Full Year
2014	March 31			June 30			September 30			December 31
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