Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Summary of Outstanding Warrants Issued by Company

Below is a summary of outstanding warrants issued by the Company as of December 31, 2017:

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
East West Bank 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

Summary of Activity under Stock-Based Compensation Plans

A summary of activity for the Company’s stock options for the year ended December 31, 2017 follows:

	Number Outstanding			Average Exercise Price per Share		Weighted Average Remaining Contractual Term (Years)		Average Intrinsic Value
Balance at December 31, 2016		832,941		$	7.11			$	—
Granted		—			—
Cancelled or Expired		(160,500	)		10.58
Exercised		—			—
Balance at December 31, 2017		672,441		$	6.28		7.48	$	—
Vested or expected to vest at    December 31, 2017		661,204		$	6.31		7.46	$	—
Exercisable at December 31, 2017		467,003		$	6.99		7.11	$	—

Summary Information about Stock Options Outstanding

The following table summarizes information about stock options outstanding as of December 31, 2017:

	Options Outstanding						Options Exercisable
Range of Exercise Prices	Number Outstanding		Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Number Exercisable		Weighted Average Exercise Price
$4.36 - $7.20		479,810		8.22	$	4.48		285,359	$	4.57
$7.50 - $11.30		162,394		5.95		9.27		151,407		9.23
$12.00 - $19.70		17,396		4.50		13.66		17,396		13.66
$21.70 - $29.20		12,841		3.28		25.35		12,841		25.35
$4.36 - $29.20		672,441						467,003

Weighted-average Assumptions Used in Estimating Fair Value of Stock Option Grants by Using Black-Scholes Pricing Model

The fair value of stock option grants was estimated using the Black Scholes pricing model with the following weighted-average assumptions for the year ended December 31, 2016:

	2017	2016
Risk-free interest rate	N/A		1.25%
Expected volatility	N/A		78.4%
Expected term in years	N/A		4.77
Dividend yield	N/A		0.0%

Summary of Restricted Stock and Restricted Stock Unit (RSU) Activity

The following is a summary of restricted stock and restricted stock unit (“RSU”) activity for the year ended December 31, 2017:

	Number Outstanding			Weighted Average Fair Value
Balance at December 31, 2016		1,973,459		$	2.80
Granted		399,551			4.64
Vested		(702,048	)		3.19
Forfeited		(210,918	)		3.01
Balance at December 31, 2017		1,460,044		$	3.08
Shares vested but not released		312,222			2.64

Stock-Based Compensation Expense Related to Stock Options and RSUs

The following table illustrates all stock-based compensation expense related to stock options and RSUs included in the consolidated statements of operations for the years ended December 31, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2017		2016
Cost of revenue	$	82	$	76
Research and development		480		352
Selling and marketing		651		632
General and administrative		1,267		1,782
Total	$	2,480	$	2,842

Schedule of Common Stock Reserved for Future Issuance

Common stock reserved for future issuance as of December 31, 2017 was as follows:

Exercise of outstanding stock options, vesting of RSUs, and issuance of RSUs vested but not released	2,444,707
ESPP	293,888
Shares of common stock available for grant under the 2011 Plan	473,624
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	5,000,000
Total	8,987,574

Common Stock Equivalents Excluded from Diluted Net loss Per Share

The following common stock equivalents have been excluded from diluted net loss per share for the fiscal years ended December 31, 2017 and 2016 because their inclusion would be anti-dilutive:

	December 31,
	2017		2016
Shares of common stock subject to outstanding RSUs		1,460,044		1,973,459
Shares of common stock subject to outstanding options		672,441		832,941
Shares of common stock subject to outstanding warrants		765,000		671,878
Shares of common stock reserved to acquire remaining share of noncontrolling interest		10,355		10,355
Shares of common stock issuable upon conversion of Series B Preferred Stock		3,000,000		—
Total		5,907,840		3,488,633