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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
 12 Months Ended
Dec. 31, 2019
Condensed Financial Information Disclosure [Abstract]  
SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)
The following presents certain unaudited quarterly financial information for the years ended December 31, 2019 and 2018. This information has been prepared on the same basis as the audited financial statements and includes all adjustments (consisting only of normal recurring adjustments) necessary to present fairly the unaudited quarterly results of operations set forth herein. Net loss per share for all periods presented has been retroactively adjusted to reflect the 1-for-3.98 reverse stock split effected on June 15, 2018.
 2019
(in thousands, except per share data)Q1Q2Q3Q4
Operating expenses$37,775  $37,837  $45,096  $58,116  
Net loss(37,897) (36,626) (44,119) (58,171) 
Net loss per share, basic and diluted$(0.90) $(0.75) $(0.89) $(1.17) 

 2018
(in thousands, except per share data)Q1Q2Q3Q4
Operating expenses$20,098  $25,279  $29,408  $28,810  
Net loss(20,504) (25,362) (29,098) (27,844) 
Net loss per share, basic and diluted$(9.00) $(10.89) $(0.71) $(0.66)