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Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
Summary of Unaudited Quarterly Financial Data
Summarized unaudited quarterly financial data for quarters ended March 31, 2018 through December 31, 2019 is as follows:

Quarters Ended:March 31, 2019June 30, 2019September 30, 2019December 31, 2019
(In thousands, except for per share data) 
Net sales$1,782  $638  $832  $529  
Gross profit$776  $360  $426  $215  
Net loss$(42,593) $(44,068) $(51,475) $(72,799) 
Basic net loss per share1
$(0.22) $(0.23) $(0.27) $(0.37) 
Diluted net loss per share1
$(0.22) $(0.23) $(0.27) $(0.37) 
Quarters Ended:March 31, 2018June 30, 2018September 30, 2018December 31, 2018
(In thousands, except for per share data) 
Net sales$507  $669  $386  $1,287  
Gross profit$312  $545  $318  $473  
Net loss$(40,562) $(12,676) $(39,184) $(45,717) 
Basic net loss per share1
$(0.21) $(0.07) $(0.20) $(0.24) 
Diluted net loss per share1
$(0.21) $(0.07) $(0.20) $(0.24) 
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1Net loss per share calculations for the quarters ended March 31, 2018 through September 30, 2019 are based on the weighted average basic and diluted shares totaling 193,663,150. Net loss per share calculations for the quarter ended December 31, 2019 are based on the weighted average basic and diluted shares of 194,378,154.