Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Schedule of Preferred Stock and the Accretion Of Dividends Activity

The following table summarizes Series B Preferred Stock and the accretion of dividends activity for the year ended December 31, 2018 (in thousands):

	Tranche 1		Tranche 2		Total
Series B Preferred Stock
Balance at December 31, 2017	$	12,000	$	—	$	12,000
Issuance of Series B Preferred Stock		—		8,000		8,000
Cumulative dividends on Series B Preferred Stock		600		233		833
Balance at December 31, 2018	$	12,600	$	8,233	$	20,833
Number of Common Shares Issuable Upon Conversion
Balance at December 31, 2017		3,000		—		3,000
Issuance of Series B Preferred Stock		—		2,000		2,000
Cumulative dividends on Series B Preferred Stock		150		58		208
Balance at December 31, 2018		3,150		2,058		5,208

Summary of Outstanding Warrants Issued by Company

Below is a summary of outstanding warrants issued by the Company as of December 31, 2018:

Warrant Type	Number of Shares Issuable Upon Exercise		Weighted Average Exercise Price		Issue Date	Expiration Date
2014 Consultant Warrant		85,000	$	10.70	August 13, 2014	August 13, 2019
EWB Warrant		40,000		3.64	February 8, 2017	February 8, 2022
VLL7 and VLL8 Warrants		580,000		2.00	February 8, 2017	February 8, 2022
2017 Consultant Warrant		60,000		4.60	February 8, 2017	February 8, 2019
Total		765,000

Schedule of Common Stock Reserved for Future Issuance

Common Stock Reserved for Future Issuance

Common stock reserved for future issuance as of December 31, 2018 was as follows:

Exercise of outstanding stock options, vesting of RSUs, and issuance of RSUs vested but not released	2,389,070
Employee Stock Purchase Plan	293,888
Shares of common stock available for grant under the 2011 Plan	643,138
Noncontrolling interest in Bluehill ID AG	10,355
Warrants to purchase common stock	765,000
Shares of common stock issuable on conversion of Series B Preferred Stock	5,208,333
Total	9,309,784