Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

v3.20.2
Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2020
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,
2020 2019 2020 2019
Cost of product sales $ 22    $ 17    $ 44    $ 92   
Research and development cost 15    19    120    134   
General and administrative expense 517    894    1,346    1,772   
Total $ 554    $ 930    $ 1,510    $ 1,998   
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. There were no options issued during the three and six months ended June 30, 2020:
Three months ended June 30, Six months ended June 30,
2019 2019
Expected stock volatility
86.3% - 87.5%
82.3% - 87.5%
Risk free interest rate
2.2% - 2.3%
2.2% - 2.5%
Expected years until exercise
2.8 - 3.4
2.2 - 2.5
Dividend yield 0  % 0  %