Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

v3.20.1
Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Schedule of the allocation of stock-based compensation
The stock-based compensation expense was allocated as follows:
Three months ended March 31,
2020 2019
Cost of product sales $ 22    $ 75   
Research and development cost 105    115   
General and administrative expense 829    877   
Total $ 956    $ 1,067   
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 period presented. There were no options issued during the three months ended March 31, 2020:
Three months ended March 31,
2019
Expected stock volatility
70.5% - 86.3%
Risk free interest rate
0.92% - 3.04%
Expected years until exercise 3.4
Dividend yield 0  %