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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)
Total
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Cumulative Translation Adjustments
Balance, shares at Dec. 31, 2018   55,089,000      
Balance, amount at Dec. 31, 2018 $ 27,178,000 $ 55,000 $ 116,876,000 $ (89,753,000) $ 0
Issuance of common stock, net of offering costs of $0.2 million, shares   1,568,000      
Issuance of common stock, net of offering costs of $0.2 million, amount 6,773,000 $ 1,000 6,772,000 0 0
Issuance of common stock for conversion of debt and accrued interest, shares   2,267,000      
Issuance of common stock for conversion of debt and accrued interest, amount 10,123,000 $ 2,000 10,121,000 0 0
Debt discount to convertible notes 282,000 $ 0 282,000 0 0
Exercise of stock options, shares   247      
Exercise of stock options, amount 606,000 $ 1,000 605,000 0 0
Exercise of warrants, shares   44      
Exercise of warrants, amount 0 $ 0 0 0 0
Share-based compensation, shares   167,000      
Share-based compensation, amount 5,474,000 $ 0 5,474,000 0 0
Net loss (23,294,000) $ 0 0 (23,294,000) 0
Balance, shares at Sep. 30, 2019   59,382,000      
Balance, amount at Sep. 30, 2019 27,142,000 $ 59,000 140,130,000 (113,047,000) 0
Balance, shares at Jun. 30, 2019   55,384,000      
Balance, amount at Jun. 30, 2019 15,145,000 $ 55,000 120,935,000 (105,845,000) 0
Issuance of common stock, net of offering costs of $0.2 million, shares   1,568,000      
Issuance of common stock, net of offering costs of $0.2 million, amount 6,773,000 $ 1,000 6,772,000 0 0
Issuance of common stock for conversion of debt and accrued interest, shares   2,267,000      
Debt discount to convertible notes 282,000 $ 0 282,000 0 0
Exercise of stock options, amount 335,000 $ 1,000 334,000 0 0
Exercise of warrants, shares   44,000      
Exercise of warrants, amount 0 $ 0 0 0 0
Net loss (7,202,000) 0 0 (7,202,000)  
Issuance of common stock for conversion of debt and accrued interest, amount 10,123,000 $ 2,000 10,121,000 0 0
Exercise of stock options, shares   119,000      
Share-based compensation 1,686,000 $ 0 1,686,000 0 0
Balance, shares at Sep. 30, 2019   59,382,000      
Balance, amount at Sep. 30, 2019 27,142,000 $ 59,000 140,130,000 (113,047,000) 0
Balance, shares at Dec. 31, 2019   59,562,000      
Balance, amount at Dec. 31, 2019 20,445,000 $ 60,000 142,285,000 (121,900,000) 0
Issuance of common stock, net of offering costs of $0.2 million, shares   1,225,000      
Issuance of common stock, net of offering costs of $0.2 million, amount 4,856,000 $ 1,000 4,855,000 0 0
Exercise of stock options, amount 2,859,000 1,000 2,858,000 0 0
Net loss (13,828,000) $ 0 0 (13,828,000) 0
Exercise of stock options, shares   800,000      
Share-based compensation 5,158,000 $ 0 5,158,000 0 0
Translation adjustment (3,000) $ 0 0 0 (3,000)
Balance, shares at Sep. 30, 2020   61,587,000      
Balance, amount at Sep. 30, 2020 19,487,000 $ 62,000 155,156,000 (135,728,000) (3,000)
Balance, shares at Jun. 30, 2020   61,421,000      
Balance, amount at Jun. 30, 2020 21,581,000 $ 61,000 153,036,000 (131,513,000) (3,000)
Exercise of stock options, amount 547,000 1,000 546,000 0 0
Net loss (4,215,000) $ 0 0 (4,215,000) 0
Exercise of stock options, shares   166,000      
Share-based compensation 1,574,000 $ 0 1,574,000 0 0
Balance, shares at Sep. 30, 2020   61,587,000      
Balance, amount at Sep. 30, 2020 $ 19,487,000 $ 62,000 $ 155,156,000 $ (135,728,000) $ (3,000)