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CONDENSED CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT - USD ($)
$ in Thousands
Shares reserved for convertible preferred stock outstanding
Series 1
Common stock
Additional paid-in capital
Accumulated comprehensive (loss) income
Deficit
Total
Balance, beginning of period at Dec. 31, 2018             $ 218,931
Balance, beginning of period (in shares) at Dec. 31, 2018             186,466,181
Balance, end of period at Dec. 31, 2019 $ 231,129           $ 231,129
Balance, end of period (in shares) at Dec. 31, 2019 191,139,933           191,139,933
Balance, beginning of period (in shares) at Dec. 31, 2018     9,583,163        
Balance, beginning of period at Dec. 31, 2018     $ 0 $ 555 $ 0 $ (210,596) $ (210,041)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Stock-based compensation       1,531     1,531
Foreign currency translation adjustments         54   54
Net loss           (59,414) (59,414)
Balance, end of period (in shares) at Dec. 31, 2019   2,961 9,392,682        
Balance, end of period at Dec. 31, 2019       3,339 54 (259,054) (255,661)
Increase (Decrease) in Temporary Equity [Roll Forward]              
Effect of exchange transaction (in shares) (15,546,014)            
Effect of exchange transaction $ (10,605)            
Balance, end of period at Mar. 31, 2020 $ 220,524            
Balance, end of period (in shares) at Mar. 31, 2020 175,593,919            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Effect of exchange transaction (in shares)     (466,711)        
Effect of exchange transaction           7,337 7,337
Issuance of common and preferred stock upon exercise of stock options and warrants (in shares)     71,770        
Issuance of common and preferred stock upon exercise of stock options and warrants       21     21
Stock-based compensation       456     456
Foreign currency translation adjustments         451   451
Net loss           (17,471) (17,471)
Balance, end of period (in shares) at Mar. 31, 2020   2,961 8,997,741        
Balance, end of period at Mar. 31, 2020       3,816 505 (269,188) (264,867)
Balance, beginning of period at Dec. 31, 2019 $ 231,129           $ 231,129
Balance, beginning of period (in shares) at Dec. 31, 2019 191,139,933           191,139,933
Balance, end of period at Dec. 31, 2020 $ 220,563           $ 220,563
Balance, end of period (in shares) at Dec. 31, 2020 175,437,783           175,437,783
Balance, beginning of period (in shares) at Dec. 31, 2019   2,961 9,392,682        
Balance, beginning of period at Dec. 31, 2019       3,339 54 (259,054) $ (255,661)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Recognition of beneficial conversion feature related to convertible notes       1,629     1,629
Stock-based compensation       4,542     4,542
Foreign currency translation adjustments         (246)   (246)
Net loss           (156,124) (156,124)
Balance, end of period (in shares) at Dec. 31, 2020   2,961 11,228,371        
Balance, end of period at Dec. 31, 2020       10,061 (192) (407,841) (397,972)
Increase (Decrease) in Temporary Equity [Roll Forward]              
Issuance of common and preferred stock upon exercise of stock options and warrants (in shares) 90,442            
Issuance of common and preferred stock upon exercise of stock options and warrants $ 392            
Balance, end of period at Mar. 31, 2021 $ 220,955           $ 220,955
Balance, end of period (in shares) at Mar. 31, 2021 175,528,225           175,528,225
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Recognition of beneficial conversion feature related to convertible notes       1,126     $ 1,126
Issuance of common and preferred stock upon exercise of stock options and warrants (in shares)     6,465,857        
Issuance of common and preferred stock upon exercise of stock options and warrants       2,755     2,755
Stock-based compensation       784     784
Foreign currency translation adjustments         251   251
Net loss           (82,553) (82,553)
Balance, end of period (in shares) at Mar. 31, 2021   2,961 17,694,228        
Balance, end of period at Mar. 31, 2021       $ 14,726 $ 59 $ (490,394) $ (475,609)