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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Allocated Stock-based Compensation Expense
The following table summarizes the components of stock-based compensation expense in the consolidated statements of operations for the three and nine months ended September 30, 2020 and 2019, respectively (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Research and development$$(1)$10 $(4)
General and administrative141 116 427 430 
Total stock-based compensation $146 $115 $437 $426 
Assumptions for Option Grants Issued
The Company uses the Black-Scholes option-pricing model to determine the fair value of all its stock options granted. The assumptions used during the nine months ended September 30, 2020 and 2019, respectively, were as follows:
Nine Months Ended September 30,
20202019
Risk free interest rate0.62 %2.49 %
Volatility106.24 %96.57 %
Expected lives (years)6.156.20
Expected dividend yield— %— %
Summary of Stock Option Activity
The following table summarizes stock option activity of the Company for the nine months ended September 30, 2020:
Total
Number of
Shares
Weighted
Average
Exercise
Price
Weighted Average Remaining Contractual Term (in years)Aggregate
Intrinsic
Value
(In Thousands)
Outstanding at December 31, 201921,520 $112.81 8.98$— 
Granted186,000 1.87 $— 
Outstanding at September 30, 2020207,520 $13.38 9.33$145 
Options exercisable at September 30, 202010,892 $129.19 8.16$— 
Summary of RSU Activity
The following table summarizes RSU activity of the Company for the nine months ended September 30, 2020:
SharesWeighted Average Grant Date Fair Value
Unvested at December 31, 2019— $— 
Granted170,000 $1.89 
Vested— $— 
Unvested at September 30, 2020170,000 $1.89