Selected Quarterly Results (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Results

The following table sets forth certain quarterly financial data for the periods indicated (in thousands, except per share data):

	Quarter Ended
	March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
Revenue	$	1,622		$	2,764		$	2,997		$	3,973
Gross profit		1,247			2,074			2,354			3,599
Loss from operations		(13,712	)		(13,808	)		(17,083	)		(11,799	)
Net loss		(12,723	)		(13,415	)		(18,486	)		(12,770	)
Basic loss per share		(0.34	)		(0.35	)		(0.49	)		(0.33	)
Diluted loss per share		(0.34	)		(0.35	)		(0.49	)		(0.33	)

	Quarter Ended
	March 31, 2012		June 30, 2012		September 30, 2012			December 31, 2012
Revenue	$	16,518	$	16,298	$	1,875		$	19,851
Gross profit		16,143		15,923		1,500			19,066
Income (loss) from operations		8,565		7,148		(14,059	)		5,408
Net income (loss)		6,751		3,783		(17,477	)		8,596
Basic income (loss) per share		0.23		0.13		(0.58	)		0.26
Diluted income (loss) per share		0.23		0.12		(0.58	)		0.19