Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Schedule of Preferred Stock and the Accretion Of Dividend Activity

The following table summarizes Series B Preferred Stock and the accretion of dividend activity for the nine months ended September 30, 2019 (in thousands):

	Tranche 1		Tranche 2		Total
Series B Preferred Stock
Balance at December 31, 2018	$	12,600	$	8,233	$	20,833
Cumulative dividends on Series B preferred stock		473		307		780
Balance at September 30, 2019	$	13,073	$	8,540	$	21,613
Number of Common Shares Issuable Upon Conversion
Balance at December 31, 2018		3,150		2,058		5,208
Cumulative dividends on Series B preferred stock		118		77		195
Balance at September 30, 2019		3,268		2,135		5,403

Summary of Outstanding Warrants Issued by Company

Below is the summary of outstanding warrants issued by the Company as of September 30, 2019:

Warrant Type	Number of Shares Issuable Upon Exercise		Weighted Average Exercise Price		Issue Date	Expiration Date
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
Total		620,000

Schedule of Common Stock Reserved for Future Issuance

Common Stock Reserved for Future Issuance

Common stock reserved for future issuance as of September 30, 2019 was as follows:

Exercise of outstanding stock options, vesting of restricted stock units ("RSU"), and    issuance of RSUs vested but not released	1,977,194
ESPP	293,888
Shares of common stock available for grant under the 2011 Plan	473,319
Warrants to purchase common stock	620,000
Shares of common stock issuable upon conversion of Series B preferred stock	7,541,449
Total	10,905,850