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Net Loss per Share - Additional Information (Details)	1 Months Ended	3 Months Ended		9 Months Ended
Net Loss per Share - Additional Information (Details)	Aug. 31, 2018 day	Sep. 30, 2020 shares	Sep. 30, 2019 shares	Sep. 30, 2020 $ / shares shares	Sep. 30, 2019 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)		7,327,232	6,237,748	7,327,232	6,237,748
Convertible Debt Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)		1,774,460	0	1,774,460	0
Debt Covenant One \| Convertible Debt
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Threshold percentage of stock price trigger	130.00%
Threshold trading days \| day	20
Threshold consecutive trading days \| day	30
2023 Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Strike price (in dollars per share) \| $ / shares				$ 41.59
2023 Notes \| Convertible Debt Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)				5,500,000
2025 Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Strike price (in dollars per share) \| $ / shares				$ 61.02
2025 Notes \| Convertible Debt Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)				3,800,000