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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 |  |  |  |

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