Warrants and Derivative Liabilities (Tables)
|
12 Months Ended |
Dec. 31, 2020 |
|---|
| Derivative Liabilities [Line Items] |
|
| Schedule of warrants vested and outstanding |
|
|
|
|
|
|
|
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|
Number of
Warrants
|
|
|
|
|
Exercise
|
|
|
Term
|
|
|
Vested and
|
|
|
Source
|
|
Price
|
|
|
(Years)
|
|
|
Outstanding
|
|
|
Pre 2015 Common Stock Warrants
|
|
$ |
1.00 |
|
|
6—10
|
|
|
|
1,110,000 |
|
|
2015 Common Stock Warrants
|
|
$ |
5.00 |
|
|
5—10
|
|
|
|
100,000 |
|
|
2016 Common Stock Warrants to Service Providers
|
|
$ |
1.15 |
|
|
|
10 |
|
|
|
40,000 |
|
|
2016 Series C Common Stock Warrants to Placement Agent
|
|
$ |
0.40 |
|
|
|
5 |
|
|
|
125,000 |
|
|
2017 Series D Common Stock Warrants to Placement Agent
|
|
$ |
0.25 |
|
|
|
5 |
|
|
|
480,000 |
|
|
2017 Common Stock Warrants to Service Provider
|
|
$ |
0.41 |
|
|
|
5 |
|
|
|
125,000 |
|
|
2018 Emerald Financing Warrants
|
|
$ |
0.10 |
|
|
|
5 |
|
|
|
3,400,000 |
|
|
Emerald Multi-Draw Credit Agreement Warrants
|
|
$ |
0.50 |
|
|
|
5 |
|
|
|
7,500,000 |
|
|
2019 Common Stock Warrants
|
|
$ |
0.35 |
|
|
|
5 |
|
|
|
8,000,000 |
|
|
2020 Common Stock Warrants
|
|
$ |
0.06 |
|
|
|
5 |
|
|
|
116,666,668 |
|
|
2020 Common Stock Warrants to Placement Agent
|
|
$ |
0.075 |
|
|
|
4.99 |
|
|
|
8,166,667 |
|
|
2020 Pre-Funded Warrants
|
|
$ |
0.001 |
|
|
Indefinite
|
|
|
|
11,800,000 |
|
|
Total warrants vested and outstanding as of December 31, 2020
|
|
|
|
|
|
|
|
|
|
|
157,513,335 |
|
|
| Schedule summary of the activity of derivative liabilities |
|
|
|
Year Ended December 31, 2020
|
|
|
|
|
December 31,
2019,
Fair
Value of
Derivative Liabilities
|
|
|
Fair
Value of
Derivative Liabilities Issued
|
|
|
Change in
Fair value of
Liabilities
|
|
|
Reclassification
of Derivatives
to Equity
|
|
|
December 31,
2020,
Fair
Value of
Derivative Liabilities
|
|
|
Emerald Multi-Draw Credit Agreement - compound derivative liability (1)
|
|
$ |
90,797 |
|
|
$ |
— |
|
|
$ |
(90,797 |
) |
|
$ |
— |
|
|
$ |
— |
|
|
Emerald Financing - warrant liability (2)
|
|
|
276,024 |
|
|
|
— |
|
|
|
(237,457 |
) |
|
|
— |
|
|
|
38,567 |
|
|
Series B - warrant liability (3)
|
|
|
134,579 |
|
|
|
— |
|
|
|
(108,016 |
) |
|
|
(26,563 |
) |
|
|
— |
|
|
Total derivative liabilities
|
|
$ |
501,400 |
|
|
$ |
— |
|
|
$ |
(436,270 |
) |
|
$ |
(26,563 |
) |
|
$ |
38,567 |
|
|
Less, noncurrent portion of derivative liabilities
|
|
|
(90,797 |
) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
— |
|
|
Current balance of derivative liabilities
|
|
$ |
410,603 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ |
38,567 |
|
|
|
|
Year Ended December 31, 2019
|
|
|
|
|
December 31, 2018, Fair Value of Derivative Liabilities
|
|
|
Fair Value of Derivative Liabilities Issued
|
|
|
Change in
Fair value of
Liabilities
|
|
|
Reclassification of Derivatives to Equity or Extinguishment
|
|
|
December 31, 2019, Fair Value of Derivative Liabilities
|
|
|
Emerald Multi-Draw Credit Agreement - compound derivative liability (1)
|
|
$ |
219,453 |
|
|
$ |
516,058 |
|
|
$ |
(484,147 |
) |
|
$ |
(160,567 |
)* |
|
$ |
90,797 |
|
|
Emerald Financing - warrant liability (2)
|
|
|
15,251,413 |
|
|
|
— |
|
|
|
(9,042,066 |
) |
|
|
(5,933,323 |
) |
|
|
276,024 |
|
|
Series B - warrant liability (3)
|
|
|
487,500 |
|
|
|
— |
|
|
|
(208,546 |
) |
|
|
(144,375 |
) |
|
|
134,579 |
|
|
Total derivative liabilities
|
|
$ |
15,958,366 |
|
|
$ |
516,058 |
|
|
$ |
(9,734,759 |
) |
|
$ |
(6,238,265 |
) |
|
$ |
501,400 |
|
|
Less, noncurrent portion of derivative liabilities
|
|
|
(219,453 |
) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
(90,797 |
) |
|
Current balance of derivative liabilities
|
|
$ |
15,738,913 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ |
410,603 |
|
*This amount has been included in the calculation of the extinguishment loss recorded in connection with the prepayment of the Emerald Credit Agreement as described in Note 4 below.
|
| Emerald Multi-Draw Credit Agreement Warrants |
|
| Derivative Liabilities [Line Items] |
|
| Schedule of input and valuation technique used to value warrant liabilities |
|
|
|
At Issuance
|
|
|
Dividend yield
|
|
|
0.00 |
% |
|
Volatility factor
|
|
91.6—92.1
|
%
|
|
Risk-free interest rate
|
|
2.23—2.51
|
%
|
|
Expected term (years)
|
|
|
5.0 |
|
|
Underlying common stock price
|
|
$0.33—0.69
|
|
|
| August 2020 Financing Warrants |
|
| Derivative Liabilities [Line Items] |
|
| Fair Value Measurement Input And Valuation Techniques Derivative Liabilities [Table Text Block] |
|
|
|
Common Stock Warrants
|
|
|
Pre-funded
Warrants
|
|
|
Placement Agent Warrants
|
|
|
Dividend yield
|
|
|
0.00 |
% |
|
|
0.00 |
% |
|
|
0.00 |
% |
|
Volatility factor
|
|
|
91.64 |
% |
|
|
93.86 |
% |
|
|
91.64 |
% |
|
Risk-free interest rate
|
|
|
0.19 |
% |
|
|
0.52 |
% |
|
|
0.19 |
% |
|
Expected term (years)
|
|
|
5.0 |
|
|
|
10 |
|
|
|
4.99 |
|
|
Underlying common stock price
|
|
$ |
0.05 |
|
|
$ |
0.05 |
|
|
$ |
0.05 |
|
|
| 2019 Common Stock Warrants |
|
| Derivative Liabilities [Line Items] |
|
| Fair Value Measurement Input And Valuation Techniques Derivative Liabilities [Table Text Block] |
|
|
|
At Issuance
|
|
|
Dividend yield
|
|
|
0.00 |
% |
|
Volatility factor
|
|
|
93.08 |
% |
|
Risk-free interest rate
|
|
|
1.62 |
% |
|
Expected term (years)
|
|
|
5.0 |
|
|
Underlying common stock price
|
|
$ |
0.22 |
|
|
| Emerald Financing Warrant Liability |
|
| Derivative Liabilities [Line Items] |
|
| Schedule of input and valuation technique used to value warrant liabilities |
|
|
|
As of December 31,
|
|
|
|
|
2020
|
|
|
2019
|
|
|
Dividend yield
|
|
|
0.00 |
% |
|
|
0.00 |
% |
|
Volatility factor
|
|
|
90.9 |
% |
|
|
79.5 |
% |
|
Risk-free interest rate
|
|
|
0.14 |
% |
|
|
1.62 |
% |
|
Expected term (years)
|
|
|
2.13 |
|
|
|
3.13 |
|
|
Underlying common stock price
|
|
$ |
0.04 |
|
|
$ |
0.13 |
|
|
| Series B Warrant Liability |
|
| Derivative Liabilities [Line Items] |
|
| Schedule of input and valuation technique used to value warrant liabilities |
|
|
|
As of
December 31,
2019
|
|
|
Dividend yield
|
|
|
0.00 |
% |
|
Volatility factor
|
|
|
79.2 |
% |
|
Risk-free interest rate
|
|
|
1.60 |
% |
|
Expected term (years)
|
|
|
0.64 |
|
|
Underlying common stock price
|
|
$ |
0.13 |
|
|