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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Development revenues:    
Government contracts and other $ 6,998 $ 2,983
Total development revenues 6,998 2,983
Operating expenses:    
Research and development 5,365 5,523
Sales and marketing 468 643
General and administrative 4,822 5,579
Total operating expenses 10,655 11,745
Operating loss (3,657) (8,762)
Other income (expense):    
Interest income 55 43
Interest expense (1,855) (1,922)
Change in fair value of warrants 3,407 2,233
Issuance cost of warrants (1,233) (470)
Total other expense 374 (116)
Loss from continuing operations (3,283) (8,878)
Loss from discontinued operations (7,604) (3,756)
Net loss (10,887) (12,634)
Income (Loss) from continuing operations (3,283) (8,878)
Beneficial conversion feature for convertible preferred stock (554) (2,487)
Net loss allocable to common stockholders - continuing operations (3,837) (11,365)
Net loss allocable to common stockholders - discontinued operations (7,604) (3,756)
Net loss allocable to common stockholders $ (11,441) $ (15,121)
Basic and diluted net loss per share attributable to common stockholders - continuing operations $ (2.77) $ (65.37)
Basic and diluted net loss per share attributable to common stockholders - discontinued operations (5.49) (21.61)
Net loss per share, basic and diluted $ (8.27) $ (86.98)
Basic and diluted weighted average shares used in calculating net loss per share attributable to common stockholders 1,384,012 173,851
Comprehensive loss:    
Net loss $ (10,887) $ (12,634)
Other comprehensive loss – foreign currency translation adjustments 0 (169)
Comprehensive loss $ (10,887) $ (12,803)