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CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($)
Common Shares [Member]
Shelf Offering
Common Shares [Member]
Additional Paid-in Capital [Member]
Shelf Offering
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Shelf Offering
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Shelf Offering
Accumulated Deficit [Member]
Convertible Preferred Stock [Member]
Shelf Offering
Convertible Preferred Stock [Member]
Shelf Offering
Total
Balance at Dec. 31, 2018       $ 179,503,000   $ (45,000)   $ (175,640,000)   $ 0   $ 3,818,000
Balance (in shares) at Dec. 31, 2018   769,890                    
Release of vested restricted common stock       (65,000)   0   0   0   (65,000)
Release of vested restricted common stock (in shares)   6,193                    
Issuance of warrants for common stock       0   0   0   0   0
Currency translation adjustment       0   (11,000)   0   0   (11,000)
Net loss       0   0   (2,565,000)   0   (2,565,000)
Balance at Mar. 31, 2019   $ 0   179,438,000   (56,000)   (178,205,000)   $ 0   1,177,000
Balance (in shares) at Mar. 31, 2019   776,083               0    
Balance at Dec. 31, 2018       179,503,000   (45,000)   (175,640,000)   $ 0   3,818,000
Balance (in shares) at Dec. 31, 2018   769,890                    
Deemed dividend from warrant repricing                       0
Convertible/Accretion preferred stock dividend           0   0        
Foreign currency translation adjustment                       (13,000)
Net loss                       (8,097,000)
Balance at Sep. 30, 2019       184,702,000   (58,000)   (183,737,000)   $ 497,000   907,000
Balance (in shares) at Sep. 30, 2019   1,024,198               250,000    
Balance at Mar. 31, 2019   $ 0   179,438,000   (56,000)   (178,205,000)   $ 0   1,177,000
Balance (in shares) at Mar. 31, 2019   776,083               0    
Issuance of common stock and warrants, net of offering costs       4,664,000   0   0   $ 0   4,664,000
Issuance of common stock and warrants, net of offering costs (in shares)   203,786                    
Proceeds from issuance of preferred stock and common stock warrants, net of issuance costs       200,000   0   0   $ 720,000   200,000
Proceeds from issuance of preferred stock and common stock warrants, net of issuance costs (in shares)                   250,000    
Convertible/Accretion preferred stock dividend       (16,000)   0   0   $ 16,000   (16,000)
Issuance of warrants for common stock (in shares)   0                    
Fair value of derivative liability in connection with issuance of preferred stock       0   0   0   (216,000)   0
Issuance of warrants for common stock in connection with preferred stock offering   $ 0   43,000   0   0   $ (43,000)   43,000
Issuance of warrants for common stock in connection with preferred stock offering (in shares)                   0    
Issuance of common stock for services       234,000   0   0   $ 0   234,000
Issuance of common stock for services (in shares)   8,077                    
Currency translation adjustment       0   (2,000)   0   0   (2,000)
Net loss       0   0   (2,824,000)   0   (2,824,000)
Balance at Jun. 30, 2019       184,563,000   (58,000)   (181,029,000)   $ 477,000   3,476,000
Balance (in shares) at Jun. 30, 2019   987,946               250,000    
Convertible/Accretion preferred stock dividend       (20,000)           $ 20,000   (20,000)
Stock-based compensation       10,000   0   0   0   10,000
Stock-based compensation (in shares)   11,000                    
Release of vested restricted common stock       (22,000)   0   0   0   (22,000)
Release of vested restricted common stock (in shares)   20,514                    
Foreign currency translation adjustment                       0
Issuance of warrants for common stock       46,000   0   0   0   46,000
Change in fair value of common stock warrants upon repricing       46,000   0   0   0   46,000
Issuance of common stock upon warrant exercise       67,000   0   0   0   67,000
Issuance of common stock upon warrant exercise   4,176                    
Issuance of common stock for services       12,000   0   0   0   12,000
Issuance of common stock for services (in shares)   563                    
Net loss       0   0   (2,708,000)   0   (2,708,000)
Balance at Sep. 30, 2019       184,702,000   (58,000)   (183,737,000)   $ 497,000   907,000
Balance (in shares) at Sep. 30, 2019   1,024,198               250,000    
Balance at Dec. 31, 2019   $ 0   188,320,000   (48,000)   (187,678,000)   $ 517,000   594,000 [1]
Balance (in shares) at Dec. 31, 2019   1,245,238               250,000    
Issuance of common stock and warrants, net of offering costs   $ 0   725,000   0   0   $ 0   725,000
Issuance of common stock and warrants, net of offering costs (in shares)   91,062               0    
Issuance of common stock in connection with notes payable   $ 0   4,000   0   0   $ 0   4,000
Issuance of common stock in connection with notes payable (in shares)   500               0    
Issuance of warrants in connection with convertible notes payable   $ 0   630,000   0   0   $ 0   630,000
Convertible/Accretion preferred stock dividend   0   (20,000)   0   0   20,000   (20,000)
Stock-based compensation   $ 0   75,000   0   0   $ 0   75,000
Stock-based compensation (in shares)   2,000               0    
Restricted stock awards cancelled   $ 0   0   0   0   $ 0   0
Restricted stock awards cancelled (in shares)   (550)               0    
Release of vested restricted common stock   $ 0   0   0   0   $ 0   0
Release of vested restricted common stock (in shares)   353                    
Net loss   $ 0   0   0   (2,680,000)   0   (2,680,000)
Balance at Mar. 31, 2020   $ 0   189,734,000   (48,000)   (190,358,000)   $ 537,000   (672,000)
Balance (in shares) at Mar. 31, 2020   1,338,603               250,000    
Balance at Dec. 31, 2019   $ 0   188,320,000   (48,000)   (187,678,000)   $ 517,000   594,000 [1]
Balance (in shares) at Dec. 31, 2019   1,245,238               250,000    
Deemed dividend from warrant repricing                       (134,000)
Convertible/Accretion preferred stock dividend   $ 0       0   0        
Foreign currency translation adjustment                       0
Net loss                       (9,068,000)
Balance at Sep. 30, 2020   $ 1,000   206,030,000   0   (196,746,000)   $ 577,000   9,285,000
Balance (in shares) at Sep. 30, 2020   7,822,375               250,000    
Balance at Mar. 31, 2020   $ 0   189,734,000   (48,000)   (190,358,000)   $ 537,000   (672,000)
Balance (in shares) at Mar. 31, 2020   1,338,603               250,000    
Issuance of common stock and warrants, net of offering costs $ 1,000   $ 9,957,000   $ 0   $ 0   $ 0   $ 9,958,000  
Issuance of common stock and warrants, net of offering costs (in shares) 4,315,000               0      
Issuance of common stock in connection with settlements   $ 0   135,000   0   0   $ 0   135,000
Issuance of common stock in connection with settlements (in shares)   60,250               0    
Deemed dividend from warrant down-round provision   $ 0   (134,000)   0   0   $ 0   (134,000)
Deemed dividend from warrant repricing   0   134,000   0   0   0   134,000
Convertible/Accretion preferred stock dividend   0   (20,000)           20,000   (20,000)
Stock-based compensation   $ 0   72,000   0   0   $ 0   72,000
Stock-based compensation (in shares)   2,000               0    
Restricted stock awards cancelled   $ 0   0   0   0   $ 0   0
Restricted stock awards cancelled (in shares)   (2,500)               0    
Issuance of common stock, prefunded warrants and warrants, net of public offering costs   $ 0   5,515,000   0   0   $ 0   5,515,000
Issuance of common stock, prefunded warrants and warrants, net of public offering costs (in shares)   1,525,000               0    
Proceeds from the exercise of prefunded warrants and common stock warrants   $ 0   37,000   0   0   $ 0   37,000
Proceeds from the exercise of prefunded warrants and common stock warrants (in shares)   485,000               0    
Gain on foreign currency translation from closure of subsidiary   $ 0   0   48,000   0   $ 0   48,000
Net loss   0   0   0   (3,398,000)   0   (3,398,000)
Balance at Jun. 30, 2020   $ 1,000   205,430,000   0   (193,756,000)   $ 557,000   11,675,000
Balance (in shares) at Jun. 30, 2020   7,723,353               250,000    
June 2020 shelf offering - issuance costs   $ 0   (42,000)   0   0   $ 0   (42,000)
Deemed dividend from warrant repricing                       0
Convertible/Accretion preferred stock dividend   0   (20,000)   0   0   20,000   (20,000)
Stock-based compensation   $ 0   662,000   0   0   0   662,000
Stock-based compensation (in shares)   98,669                    
Release of vested restricted common stock   $ 0   0   0   0   0   0
Release of vested restricted common stock (in shares)   353                    
Foreign currency translation adjustment                       0
Net loss   $ 0   0   0   (2,990,000)   0   (2,990,000)
Balance at Sep. 30, 2020   $ 1,000   $ 206,030,000   $ 0   $ (196,746,000)   $ 577,000   $ 9,285,000
Balance (in shares) at Sep. 30, 2020   7,822,375               250,000    
[1] The condensed consolidated balance sheet as of December 31, 2019 was derived from the audited consolidated balance sheet as of that date.