Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Schedule of Preferred Stock and the Accretion of Dividend Activity

The following tables summarize Series B convertible preferred stock and the accretion of dividend activity for the nine months ended September 30, 2020 (in thousands):

	Total
Series B Convertible Preferred Stock:
Balance as of December 31, 2019	$	21,875
Cumulative dividends on Series B convertible preferred stock		818
Balance as of September 30, 2020	$	22,693
Number of Common Shares Issuable Upon Conversion:
Balance as of December 31, 2019		5,469
Cumulative dividends on Series B convertible preferred stock		204
Balance as of September 30, 2020		5,673

Summary of Outstanding Warrants Issued by Company

Below is the summary of outstanding warrants issued by the Company as of September 30, 2020:

Warrant Type	Number of Shares Issuable Upon Exercise		Exercise Price		Issue Date	Expiration Date
East West Bank Warrant		40,000	$	3.50	February 8, 2017	February 8, 2023
April 21 Funds Warrants		275,000	$	3.50	May 5, 2020	May 5, 2023
Total		315,000

Schedule of Common Stock Reserved for Future Issuance

Common Stock Reserved for Future Issuance

Common stock reserved for future issuance as of September 30, 2020 was as follows:

Exercise of outstanding stock options, vesting of restricted stock units ("RSU"), and    issuance of RSUs vested but not released	1,710,044
Employee Stock Purchase Plan	293,888
Shares of common stock available for grant under the 2011 Plan	1,166,485
Warrants to purchase common stock	315,000
Shares of common stock issuable upon conversion of Series B convertible preferred stock	7,541,449
Total	11,026,866