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Consolidated Statements of Shareholders' Equity (Deficit) - USD ($)
$ in Thousands
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Parent [Member]
Noncontrolling Interest [Member]
Total
Balance (in shares) at Dec. 31, 2017 22,530,702            
Balance at Dec. 31, 2017 $ 2 $ 151,147 $ (123,891) $ (182) $ 27,076 $ 960 $ 28,036
Issuance of ordinary shares (in shares) 739,095            
Issuance of ordinary shares 13,245 13,245 13,245
Share-based compensation (Note 9) (in shares) (85,185)            
Share-based compensation (Note 9) 6,558 6,558 2 6,560
Foreign currency translation adjustment gain (loss) 224 224 27 251
Net loss (54,869) (54,869) (2,605) (57,474)
Balance (in shares) at Dec. 31, 2018 23,184,612            
Balance at Dec. 31, 2018 $ 2 170,950 (178,760) 42 (7,766) (1,616) (9,382)
Issuance of ordinary shares (in shares) 4,588,574            
Issuance of ordinary shares $ 1 68,565 68,566 68,566
Share-based compensation (Note 9) (in shares) 112,427            
Share-based compensation (Note 9) 2,101 2,101 2,101
Foreign currency translation adjustment gain (loss) 98 98 (2) 96
Net loss (38,085) (38,085) (2,248) (40,333)
Capital contribution from noncontrolling interests 5,941 5,941 4,142 10,083
Capital contribution shared by noncontrolling interests (578) (578) 578
Balance (in shares) at Dec. 31, 2019 27,885,613            
Balance at Dec. 31, 2019 $ 3 246,979 (216,845) 140 30,277 854 31,131
Issuance of ordinary shares (in shares) 11,238,590            
Issuance of ordinary shares $ 1 111,593 111,594 111,594
Share-based compensation (Note 9) (in shares) 17,710            
Share-based compensation (Note 9) 7,946 7,946 225 8,171
Foreign currency translation adjustment gain (loss) (437) (437) (93) (530)
Net loss (60,973) (60,973) (2,848) (63,821)
Capital contribution from noncontrolling interests 80 80
Capital contribution shared by noncontrolling interests (67) (67) 67
Balance (in shares) at Dec. 31, 2020 39,141,913            
Balance at Dec. 31, 2020 $ 4 $ 366,451 $ (277,818) $ (297) $ 88,340 $ (1,715) $ 86,625