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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Allocated Stock-based Compensation Expense
The following table summarizes the components of stock-based compensation expense in the condensed consolidated statements of operations for the three and nine months ended September 30, 2018 and 2017, respectively (in thousands):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Research and development
$
21

 
$
543

 
$
55

 
$
729

General and administrative
115

 
724

 
229

 
3,047

Total stock-based compensation
$
136

 
$
1,267

 
$
284

 
$
3,776

Assumptions for Option Grants Issued
The Company uses the Black-Scholes option-pricing model and the following assumptions were used to determine the fair value of all its stock options granted during the nine months ended September 30, 2018:

 
Nine Months Ended September 30, 2018
Risk free interest rate
2.73
%
Volatility
80.83
%
Expected lives (years)
6.20

Expected dividend yield
%
Stock Option Activity
The following table summarizes stock option activity of the Company for the nine months ended September 30, 2018:

 
Total
Number of
Shares
(In Thousands)
 
Weighted
Average
Exercise
Price
 
Weighted Average Remaining Contractual Term (in years)
 
Aggregate
Intrinsic
Value
(In Thousands)
Outstanding at January 1, 2018
10

 
$
1,240.55

 
1.00
 
$

Granted
483

 
5.24

 
 
 

Canceled
(59
)
 
5.24

 
 
 
$

Outstanding at September 30, 2018
434

 
$
34.17

 
9.26
 
$

Options exercisable at September 30, 2018
43

 
$
265.35

 
7.51
 
$