Supplemental Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information

The following is a summary of unaudited selected quarterly financial information for the three months ended 2020 (in thousands, except per share data):

	December 31,		September 30,		June 30,		March 31,
Net sales	$	3,110	$	3,588	$	2,125	$	2,342
Gross profit	$	1,149	$	1,301	$	954	$	1,055
Loss from operations	$	(15,080)	$	(15,165)	$	(15,725)	$	(17,730)
Net loss	$	(18,912)	$	(18,757)	$	(19,230)	$	(21,309)
Basic and diluted net loss per share	$	(0.33)	$	(0.33)	$	(0.35)	$	(0.39)

The following is a summary of unaudited selected quarterly financial information for the three months ended 2019 (in thousands, except per share data):

	December 31,		September 30,		June 30,		March 31,
Net sales	$	3,470	$	2,271	$	1,806	$	1,750
Gross profit	$	1,513	$	1,154	$	899	$	834
Loss from operations	$	(18,269)	$	(17,653)	$	(18,087)	$	(18,822)
Net loss	$	(21,335)	$	(20,434)	$	(20,815)	$	(21,721)
Basic and diluted net loss per share	$	(0.40)	$	(0.37)	$	(0.38)	$	(0.40)