Stock-Based Compensation (Tables)
|
3 Months Ended |
12 Months Ended |
Mar. 31, 2020 |
Dec. 31, 2019 |
Stock-Based Compensation [Abstract] |
|
|
Summary Of Stock Compensation Expense |
|
|
|
|
|
|
For the Three Months Ended
March 31,
|
|
2020
|
2019
|
Statement of operations line item:
|
|
|
|
|
General and administrative
|
$
|
72,420
|
$
|
116,679
|
Research and development
|
|
3,882
|
|
44,321
|
|
|
|
|
|
Total
|
$
|
76,302
|
$
|
161,000
|
|
|
|
|
|
|
|
For the Year Ended December 31,
|
|
2019
|
2018
|
Statement of operations line item:
|
|
|
|
|
General and administrative
|
$
|
393,483
|
$
|
883,855
|
Research and development
|
|
63,267
|
|
344,480
|
|
|
|
|
|
Total
|
$
|
456,750
|
$
|
1,228,335
|
|
Schedule Of Assumptions Made In Calculating The Fair Value Of Options |
|
|
|
|
|
|
|
|
|
|
|
|
For the Year Ended December 31,
|
|
2019
|
2018
|
Black-Scholes assumptions
|
|
|
|
|
Expected dividend yield
|
0
|
%
|
0
|
%
|
Expected volatility
|
74-75
|
%
|
69-73
|
%
|
Risk-free interest rate
|
1.9-2.6
|
%
|
2.3-2.9
|
%
|
Expected term (in years)
|
5.5-6 years
|
|
5.5-6 years
|
|
|
Summary Of Share-Based Transactions |
|
|
|
|
|
|
|
|
|
|
|
|
|
Number of Options
|
|
Weighted Average Exercise Price
|
Weighted Average Remaining Contractual Term
|
|
Aggregate Intrinsic Value
|
Outstanding, January 1, 2020
|
204,574
|
$
|
35.60
|
7.3 years
|
$
|
-
|
Granted
|
-
|
$
|
-
|
|
|
|
Exercised
|
-
|
$
|
-
|
|
|
|
Expired
|
(2,498)
|
$
|
159.60
|
|
|
|
Cancelled
|
(53,054)
|
$
|
60.40
|
|
|
|
|
|
|
|
|
|
|
Outstanding, March 31, 2020
|
149,022
|
$
|
24.69
|
7.8 years
|
$
|
-
|
Exercisable, March 31, 2020
|
75,304
|
$
|
37.16
|
7.0 years
|
$
|
-
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Number of Options
|
|
Weighted Average Exercise Price
|
Weighted Average Remaining Contractual Term
|
|
Aggregate Intrinsic Value
|
Outstanding, January 1, 2019
|
255,922
|
$
|
41.88
|
7.8 years
|
$
|
-
|
Granted
|
52,465
|
$
|
6.41
|
|
|
|
Exercised
|
-
|
$
|
-
|
|
|
|
Expired
|
(2,080)
|
$
|
97.78
|
|
|
|
Cancelled
|
(101,733)
|
$
|
34.99
|
|
|
|
|
|
|
|
|
|
|
Outstanding, December 31, 2019
|
204,574
|
$
|
35.60
|
7.3 years
|
$
|
-
|
Exercisable, December 31, 2019
|
123,263
|
$
|
51.15
|
6.2 years
|
$
|
-
|
|
Summary Of Unvested Shares |
|
|
|
|
|
|
|
|
|
2020
|
|
Number of Options
|
Weighted Average Fair Value at Grant Date
|
Unvested at January 1, 2020
|
81,311
|
$
|
7.90
|
Granted
|
-
|
$
|
-
|
Vested
|
(7,593)
|
$
|
8.34
|
Cancelled
|
-
|
$
|
-
|
|
|
|
|
Unvested at March 31, 2020
|
73,718
|
$
|
7.85
|
|
|
|
|
|
|
|
|
|
|
2019
|
|
Number of Options
|
Weighted Average Fair Value at Grant Date
|
Unvested at January 1, 2019
|
131,531
|
$
|
13.19
|
Granted
|
52,465
|
$
|
4.20
|
Vested
|
(51,386)
|
$
|
14.12
|
Cancelled
|
(51,299)
|
$
|
11.47
|
|
|
|
|
Unvested at December 31, 2019
|
81,311
|
$
|
7.90
|
|
Summary Of RSU Activity |
|
|
|
|
|
|
Number of RSUs
|
|
Weighted Average Grant Date Fair Value
|
Outstanding, January 1, 2019
|
1,394
|
$
|
22.08
|
Granted
|
-
|
$
|
-
|
Vested and Released
|
(464)
|
$
|
22.08
|
Cancelled
|
(930)
|
$
|
22.08
|
|
|
|
|
Outstanding, December 31, 2019
|
-
|
$
|
-
|
|