Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2019

Schedule of the allocation of stock-based compensation

The stock-based compensation expense was allocated as follows:



	Three months ended September 30,				Nine months ended September 30,
	2019		2018		2019		2018
Cost of product sales	$	32	$	35	$	124	$	132
Research and development cost	34		26		168		215
General and administrative expense	835		300		2,607		506
Total	$	901	$	361	$	2,899	$	853

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 September 30,				Nine months ended September 30,
	2019		2018		2019		2018

Expected stock volatility	86.2% - 86.5%		78.0% - 79.3%		82.3% - 87.5%		78.0% - 86.3%
Risk free interest rate	1.7% - 1.8%		2.6% - 2.9%		1.7% - 2.6%		2.1% - 2.9%
Expected years until exercise	3.5		3.5		1.0 - 4.0		2.5 - 3.5
Dividend yield	0	%	0	%	0	%	0	%