Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

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 and 2017 (in thousands):

	Common Stock Warrant Liabilities
Balance at December 31, 2015	$	687
Changes in fair value		387
Conversion to common stock		(1,074	)
Balance at December 31, 2016	$	—
Transfer from equity		29,413
Changes in fair value		(12,044	)
Exercises		(2,311	)
Transfer to equity		(15,058	)
Balance at December 31, 2017	$	-

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, 2017 and 2016 are as follows:

	Year Ended December 31,
	2017			2016
Risk-free interest rate		2.01	%		1.78	%
Expected dividend yield		—			—
Weighted average expected life (years)		6.02			5.69
Volatility		79	%		78	%

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,
	2017		2016
Cost of revenues	$	40	$	36
Research and development		127		438
Sales and marketing		480		258
General and administrative		3,255		894
Total	$	3,902	$	1,626

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,
	2017						2016
	Continuing operations			Discontinued operations			Continuing operations			Discontinued operations
Numerator:
Net (loss) income, basic	$	(4,540	)	$	2,246		$	(26,301	)	$	(3,624	)
Change in fair value of warrants	$	12,044		$	-		$	-		$	-
Net (loss) income, diluted	$	(16,584	)	$	2,246		$	(26,301	)	$	(3,624	)
Denominator:
Weighted average common shares outstanding		12,827			12,827			8,646			8,646
Weighted average unvested common shares subject to repurchase		(39	)		(39	)		(64	)		(64	)
Weighted average common shares outstanding - basic		12,788			12,788			8,582			8,582
Dilutive impact of warrants		494			494			—			—
Weighted average common shares outstanding - diluted		13,282			13,282			8,582			8,582
Basic net (loss) income per share	$	(0.36	)	$	0.18		$	(3.06	)	$	(0.42	)
Diluted net (loss) income per share	$	(1.25	)	$	0.17		$	(3.06	)	$	(0.42	)

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,
	2017		2016
Options to purchase common stock		3,156		604
Warrants to purchase common stock		1,204		8
Series A convertible preferred stock		3,829		—
Unvested restricted stock awards		39		177
		8,228		789