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Description of Business and Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]  
Schedule of cash and cash equivalent and restricted cash
(in thousands)  March 31,
2021		   December 31,
2020		 
Cash and cash equivalents  $72,253   $63,560 
Restricted cash – current   48    48 
Restricted cash – long-term   392    391 
Cash, cash equivalents and restricted cash  $72,693   $63,999 
Schedule of antidilutive securities excluded from computation of diluted net loss per share
(in thousands)  March 31,
2021		   March 31,
2020		 
Options   843    368 
Warrants   2,114    2,871 
Total   2,957    3,239