Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]        
Collaboration revenue $ 142 $ 1,183 $ 1,795 $ 7,248
Operating expenses:        
Research and development 1,281 3,337 6,657 13,585
General and administrative 3,211 3,901 8,713 7,290
Total operating expenses 4,492 7,238 15,370 20,875
Loss from operations (4,350) (6,055) (13,575) (13,627)
Investment and other income, net 24 54 27 64
Gain on extinguishment 0 2,318 0 2,318
Interest expense 0 (1,098) 0 (1,982)
Change in fair value of warrant and derivative liability 0 0 0 212
Net loss (4,326) (4,781) (13,548) (13,015)
Reduction (accretion) of redeemable convertible preferred stock to redemption value 0 (82) 0 10,274
Net loss attributable to common stockholders $ (4,326) $ (4,863) $ (13,548) $ (2,741)
Net loss per common share attributable to common stockholders, basic and diluted (in usd per share) $ (0.15) $ (1.65) $ (0.82) $ (1.98)
Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted (in shares) 28,107,785 2,943,896 16,475,843 1,382,592
Revenue, Product and Service [Extensible List]     us-gaap:ProductAndServiceOtherMember