Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2021

Stockholders' Equity

Schedule of allocation of stock-based compensation expense

	Three Months Ended
	March 31,
	2021		2020
Cost of goods sold	$	60	$	—
Research and development		107		198
Selling and marketing		35		17
General and administrative		540		406
Total	$	742	$	621