Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2021

Stockholders' Equity

Schedule of allocation of stock-based compensation expense

Stock-based compensation expense was allocated as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2021		2020		2021		2020
Cost of goods sold	$	84	$	—	$	219	$	—
Research and development		134		134		362		471
Selling and marketing		31		23		109		86
General and administrative		638		490		1,782		1,550
Total	$	887	$	647	$	2,472	$	2,107