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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,
2020201920202019
Cost of product sales$22  $17  $44  $92  
Research and development cost15  19  120  134  
General and administrative expense517  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,
20192019
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%%