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Consolidated Statements of Stockholders' Equity - USD ($)
Common Stock [Member]
Private Placement
Common Stock [Member]
Additional Paid-In Capital [Member]
Private Placement
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Private Placement
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [Member]
Private Placement
Accumulated Other Comprehensive Income [Member]
Class A Preferred Stock
Private Placement
Class A Preferred Stock
Class B Preferred Stock
Private Placement
Class B Preferred Stock
Class C Preferred Stock
Private Placement
Total
Balance at Dec. 31, 2018   $ 30,000   $ 179,502,000   $ (140,988,000)   $ 3,000   $ 0   $ 0     $ 38,547,000
Balance (in shares) at Dec. 31, 2018   30,319,038                   0      
Net loss   $ 0   0   (18,332,000)   0   0   $ 0     (18,332,000)
Other comprehensive income (loss), net of taxes   0   0   0   (48,000)   0   0     (48,000)
Stock-based compensation expense   0   6,871,000   0   0   0   0     6,871,000
Accelerated stock-based compensation expense   0   9,562,000   0   0   0   0     9,562,000
Stock issued during period value new issues   $ 4,000   68,806,000   0   0   0   $ 0     68,810,000
Stock issued during period, new issues (in shares)   4,312,500                   0      
Issuance of common stock for board of director compensation   $ 0   91,000   0   0   0   $ 0     91,000
Issuance of common stock for board of director compensation (in shares)   5,753                   0      
Issuance of common stock for convertible debt and accrued interest   $ 1,000   15,416,000   0   0   0   $ 0     15,417,000
Issuance of common stock for convertible debt and accrued interest (in shares)   1,172,305                   0      
Proceeds from exercise of stock options and warrants   $ 2,000   5,361,000   0   0   0   $ 0     5,363,000
Proceeds from exercise of stock options and warrants (in shares)   1,530,191                   0      
Balance at Dec. 31, 2019   $ 37,000   285,609,000   (159,320,000)   (45,000)   0   $ 0     126,281,000
Balance (in shares) at Dec. 31, 2019   37,339,787                   0      
Net loss   $ 0   0   (32,693,000)   0   0   $ 0     (32,693,000)
Other comprehensive income (loss), net of taxes   0   0   0   5,421,000   0   0     5,421,000
Stock-based compensation expense   0   8,833,000   0   0   0   0     8,833,000
Stock issued during period value new issues $ 1,000 $ 0 $ 28,159,000 237,225,000 $ 0 0 $ 0 0 $ 0 0 $ 0 $ 0   $ 28,160,000 237,225,000
Stock issued during period, new issues (in shares) 675,536 0                 0 0 250,000    
Issuance of common stock for board of director compensation   $ 0   83,000   0   0   0   $ 0     83,000
Issuance of common stock for board of director compensation (in shares)   2,869                          
Proceeds from exercise of stock options and warrants   $ 2,000   9,386,000   0   0   0   $ 0     9,388,000
Proceeds from exercise of stock options and warrants (in shares)   1,818,866                   0      
Beneficial conversion feature of the Series C convertible preferred stock   $ 0   39,492,000   0   0   0   $ 0 $ (39,492,000)   0
Deemed dividend on the Series C convertible preferred stock   0   (39,492,000)   0   0   0   0 39,492,000   0
Paid-in-kind preferred stock dividend, including beneficial conversion feature   0   (2,844,000)   0   0   0   0 2,844,000   0
Balance at Dec. 31, 2020   $ 40,000   $ 566,451,000   $ (192,013,000)   $ 5,376,000   $ 0   $ 0 $ 2,844,000   $ 382,698,000
Balance (in shares) at Dec. 31, 2020   39,837,058                     250,000