Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Reconciliation of liabilities measured at fair value using significant unobservable inputs

The following table provides a reconciliation of liabilities measured at fair value using significant unobservable inputs (Level 3) for the year ended December 31, 2016 (in thousands):

	Common Stock Warrant Liabilities
Balance at December 31, 2013	$	—
Issuance		11,280
Changes in fair value		(2,578	)
Balance at December 31, 2014		8,702
Changes in fair value		(8,015	)
Balance at December 31, 2015		687
Changes in fair value		387
Conversion to common stock		(1,074	)
Balance at December 31, 2016	$	—

Summary of assumptions used to compute stock-based compensation costs for stock options granted

The assumptions used to compute the stock-based compensation costs for the stock options granted during the years ended December 31, 2016, 2015 and 2014 are as follows:

	Year Ended December 31,
	2016			2015		2014
Risk-free interest rate		1.78	%	1.6-1.8%		1.8-1.9%
Expected dividend yield		—			—		—
Weighted average expected life (years)		5.69		5.4-5.5		5.4-5.5
Volatility		78	%	59-68%		60-71%

Summary of compensation cost for stock-based compensation arrangements

The compensation cost that has been included in the Company’s consolidated statement of operations for all stock-based compensation arrangements is detailed as follows (in thousands):

	Year Ended December 31,
	2016		2015		2014
Cost of revenues	$	36	$	72	$	274
Research and development		438		286		2,080
Sales and marketing		258		316		385
General and administrative		894		1,893		1,665
Discontinued operations		—		76		150
Total	$	1,626	$	2,643	$	4,554

Weighted average number of common shares outstanding

The following table sets forth the computation of basic and diluted loss per share, as adjusted for the 1-for-12 reverse stock split stock split (in thousands, except per share data):

	Year Ended December 31,
	2016						2015						2014
	Continuing operations			Discontinued operations			Continuing operations			Discontinued operations			Continuing operations			Discontinued operations
Numerator
Net loss, basic	$	(26,301	)	$	(3,624	)	$	(171,253	)	$	(7,423	)	$	(98	)	$	(12,784	)
Decrease in fair value of warrants		—			—			—			—			(2,578	)		—
Diluted net loss attributable to common stockholders		(26,301	)		(3,624	)		(171,253	)		(7,423	)		(2,676	)		(12,784	)
Denominator
Weighted average common shares outstanding		8,646			8,646			8,365			8,365			8,178			8,178
Weighted average unvested common shares subject to repurchase		(64	)		(64	)		(68	)		(68	)		(66	)		(66	)
Weighted average common shares outstanding - basic		8,582			8,582			8,298			8,298			8,112			8,112
Effect of dilutive securities:
Common stock warrants		—			—			—			—			32			32
Weighted average common shares outstanding, diluted		8,582			8,582			8,298			8,298			8,145			8,145
Basic net loss per share	$	(3.06	)	$	(0.42	)	$	(20.64	)	$	(0.89	)	$	(0.01	)	$	(1.58	)
Diluted net loss per share	$	(3.06	)	$	(0.42	)	$	(20.64	)	$	(0.89	)	$	(0.33	)	$	(1.57	)

Weighted-average anti-dilutive securities not included in diluted net loss per share

The anti-dilutive securities not included in diluted net loss per share were as follows, as adjusted for the 1-for-12 reverse stock split (in thousands):

	Year Ended December 31,
	2016		2015		2014
Options to purchase common stock		604		662		588
Warrants to purchase common stock		8		962		60
Unvested restricted stock awards		177		68		66
		789		1,691		714