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Summary of Significant Accounting Policies - Antidilutive Securities Table (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 30,737,956 10,449,150 8,937,494
Options to purchase common stock      
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 9,265,390 8,752,677 7,694,870
Restricted stock units      
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 2,069,936 1,688,017 1,234,168
Convertible preferred stock      
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 8,456 8,456 8,456
6.50% Convertible Senior Notes Due 2024 | Convertible Debt Securities      
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 14,585,653 0 0
August 2019 Convertible Bonds | Convertible Debt Securities      
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 3,799,071 0 0
December 2019 Convertible Bonds | Convertible Debt Securities      
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect      
Total antidilutive securities (shares) 1,009,450 0 0