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Consolidated Statements of Changes in Stockholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Other Comprehensive Loss [Member]
Accumulated Deficit [Member]
Noncontrolling Interests [Member]
Balance at Dec. 31, 2014 $ 240,676 $ 590 $ 546,247 $ (3,149) $ (322,283) $ 19,271
Balance, Shares at Dec. 31, 2014   59,046,296        
Net loss (85,779) $ 0 0 0 (85,779) 0
Change in unrealized loss on investments (164) 0 0 (164) 0 0
Foreign currency translation adjustments 1,662 0 0 1,662 0 0
Shares issued from stock plans, net of payroll taxes paid 12,707 $ 29 12,678 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   2,817,988        
True up of issuance costs related to initial public offering and common stock sold by FibroGen Europe 42 $ 0 42 0 0 0
Stock-based compensation 27,681 0 27,681 0 0 0
Warrants exercised 0 $ 1 (1) 0 0 0
Warrants exercised, Shares   120,795        
Balance at Dec. 31, 2015 196,825 $ 620 586,647 (1,651) (408,062) 19,271
Balance, Shares at Dec. 31, 2015   61,985,079        
Net loss (61,680) $ 0 0 0 (61,680) 0
Change in unrealized loss on investments 159 0 0 159 0 0
Foreign currency translation adjustments 532 0 0 532 0 0
Shares issued from stock plans, net of payroll taxes paid 7,141 $ 17 7,124 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   1,660,759        
Stock appreciation rights settled 0 $ 0 0 0 0 0
Stock appreciation rights settled, Shares   17,855        
Stock-based compensation 32,132 $ 0 32,132 0 0 0
Warrants exercised 0 $ 0 0 0 0 0
Warrants exercised, Shares   1,591        
Balance at Dec. 31, 2016 175,109 $ 637 625,903 (960) (469,742) 19,271
Balance, Shares at Dec. 31, 2016   63,665,284        
Net loss (126,203) $ 0 0 0 (126,203) 0
Change in unrealized loss on investments 1,187 0 0 1,187 0 0
Foreign currency translation adjustments (2,022) 0 0 (2,022) 0 0
Follow-on Offerings, net of underwriting discounts, commission and issuance costs 470,226 $ 144 470,082 0 0 0
Follow-on Offerings, net of underwriting discounts, commission and issuance costs, Shares   14,428,750        
Shares issued from stock plans, net of payroll taxes paid 26,614 $ 44 26,570 0 0 0
Shares issued from stock plans, net of payroll taxes paid, Shares   4,404,094        
Stock-based compensation 37,539 $ 0 37,539 0 0 0
Balance at Dec. 31, 2017 $ 582,450 $ 825 $ 1,160,094 $ (1,795) $ (595,945) $ 19,271
Balance, Shares at Dec. 31, 2017   82,498,128