Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

v3.19.2
Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Schedule of the allocation of stock-based compensation
The stock-based compensation expense was allocated as follows:
 
Three months ended June 30,
Six months ended June 30,
 
2019
 
2018
2019
 
2018
Cost of product sales
$
17

 
$
47

$
92

 
$
97

Research and development cost
19

 
77

134

 
189

General and administrative expense
894

 
224

1,772

 
206

Total
$
930

 
$
348

$
1,998

 
$
492

Schedule of assumptions used in the Black-Scholes-Merton option-pricing model
The following assumptions were used in the Black-Scholes-Merton pricing model to estimate the fair value of options granted during the periods presented:
 
Three months ended June 30,
Six months ended June 30,
 
2019
 
2018
2019
 
2018
 
 
 
 
 
 
 
Expected stock volatility
86.3% - 87.5%

 
79.5% - 86.3%

82.3% - 87.5%

 
78.4% - 86.3%

Risk free interest rate
2.2% - 2.3%

 
2.4% - 2.8%

2.2% - 2.5%

 
2.1% - 2.8%

Expected years until exercise
2.8 - 3.4

 
2.5 - 3.5

2.2 - 2.5

 
2.5 - 3.5

Dividend yield
0
%
 
0
%
0
%
 
0
%