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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Common Stock Reserved for Future Issuance
The following shares of common stock were reserved for future issuance as of March 31, 2020 (in thousands):
 
Class A-1 convertible preferred stock outstanding (as-converted)
4,159

Class A-2 convertible preferred stock outstanding (as-converted)
26,317

Initial Closing warrants
13,890

Milestone Closing warrants
32,884

Common stock options outstanding
6,116

RSUs outstanding
89

Common stock available for future grant under 2019 Equity Incentive Plan
1,571

Employee Stock Purchase Plan
190

Total common shares reserved for future issuance
85,216
Stock Option Activity
The following table summarizes our stock option and RSU activity (together Stock Awards) under all equity incentive plans for the three months ended March 31, 2020 (shares in thousands): 
 
Number of
options
 
Weighted
average
exercise
price
 
Number of
RSUs
 
Weighted average grant date fair value
Stock Awards outstanding at December 31, 2019
3,098

 
$
1.17

 
129

 
$
1.50

Granted
3,073

 
$
1.31

 
—

 
$
—

Exercised (options) or Vested (RSUs)
(1
)
 
$
0.95

 
(21
)
 
$
1.50

Canceled/forfeited/expired
(54
)
 
$
1.78

 
(19
)
 
$
1.50

Stock Awards outstanding at March 31, 2020
6,116

 
$
1.24

 
89

 
$
1.50
Assumptions Used to Estimate Fair Value of Stock Options and Performance Stock and Employee Stock Purchase Plan
The following table summarizes the weighted average assumptions used to estimate the fair value of stock options and performance stock awards granted to employees under our 2012 Equity Incentive Plan, 2015 Inducement Plan and 2019 Equity Incentive Plan and the shares purchasable under our Employee Stock Purchase Plan during the periods presented:
 
 
Three months ended
March 31,
 
2020
 
2019
Stock options and performance stock options
 
 
 
Risk-free interest rate
1.4
%
 
2.6
%
Volatility
95.4
%
 
93.8
%
Dividend yield
—

 
—

Expected term (years)
6.1

 
6.1

Employee stock purchase plan shares
 
Risk-free interest rate
1.4
%
 
2.4
%
Volatility
105.9
%
 
119.4
%
Dividend yield
—

 
—

Expected term (years)
0.5

 
0.5
Stock-Based Compensation
The following table summarizes the allocation of our stock-based compensation expense for all stock awards during the periods presented (in thousands): 
 
Three months ended
March 31,
 
2020
 
2019
Research and development
$
157

 
$
471

General and administrative
666

 
488

Total
$
823

 
$
959