Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Summary of Outstanding Warrants Issued by Company

Below is the summary of outstanding warrants issued by the Company as of March 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
2013 Private Placement Warrants		186,878		10.00	August 14, 2013	August 14, 2017
Total		951,878

Summary of Activity under Stock-Based Compensation Plans

A summary of activity for the Company’s stock option plans for the three months ended March 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		(52,004	)		13.61
Exercised		—			—
Balance at March 31, 2017		780,937		$	6.66		7.29	$	1,309,182
Vested or expected to vest at     March 31, 2017		757,061		$	6.72		7.24	$	1,248,383
Exercisable at March 31, 2017		462,348		$	7.82		6.18	$	552,005

Summary Information about Options Outstanding

The following table summarizes information about options outstanding as of March 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		518,310		8.32	$	4.54		236,678	$	4.74
$7.50 - $11.30		222,346		5.24		9.64		185,389		9.66
$12.00 - $19.70		27,390		6.04		13.66		27,390		13.66
$21.70 - $29.20		12,891		4.11		25.37		12,891		25.37
$4.36 - $29.20		780,937		7.29	$	6.66		462,348	$	7.82

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 three months ended March 31, 2017:

	Number Outstanding			WeightedAverage Fair Value
Balance at December 31, 2016		1,973,459		$	2.80
Granted		90,000			5.53
Vested		(110,568	)		5.37
Forfeited		(30,780	)		3.18
Balance at March 31, 2017		1,922,111		$	2.77
Shares vested but not released		43,018		$	2.53

Stock-Based Compensation Expense Related to Stock Options and RSUs

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

	Three Months Ended
	March 31,
	2017		2016
Cost of revenue	$	24	$	23
Research and development		115		84
Selling and marketing		160		207
General and administrative		292		623
Total	$	591	$	937

Schedule of Common Stock Reserved for Future Issuance

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

Exercise of outstanding stock options and vesting of RSUs	2,703,048
ESPP	293,888
Shares of common stock available for grant under the 2011 Plan	332,544
Noncontrolling interest in Bluehill AG	10,355
Warrants to purchase common stock	951,878
Total	4,291,713