v3.21.2

Summary of Significant Accounting Policies - Summary of Basic and Diluted Net Loss per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net loss	$ (31,583)	$ (26,720)	$ (87,365)	$ (99,799)
Denominator:
Weighted-average common shares outstanding, basic (in shares)	56,559	53,574	56,242	51,141
Weighted-average common shares outstanding, diluted (in shares)	56,559	53,574	56,242	51,141
Net loss per common share, basic (usd per share)	$ (0.56)	$ (0.50)	$ (1.55)	$ (1.95)
Net loss per common share, diluted (usd per share)	(0.56)	$ (0.50)	$ (1.55)	$ (1.95)
Antidilutive securities excluded from computation of earnings per share (in shares)			2,989	4,556
Warrant Transaction
Denominator:
Warrant strike price (usd per share)	78.75		$ 78.75
Convertible Senior Notes Due February 2023 | Convertible Debt | Bond Hedge
Denominator:
Conversion price (usd per share)	57.38		57.38
Convertible Notes Due 2025 | Convertible Debt
Denominator:
Conversion price (usd per share)	140.14		140.14
Convertible Senior Notes Due June 2026 | Convertible Debt
Denominator:
Conversion price (usd per share)	$ 88.61		$ 88.61
Stock options, restricted stock units, and market stock units
Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)			2,296	3,140
Shares related to the 2023 Notes
Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)			86	1,226
Convertible Senior Notes Due February 2023
Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)			48	190
Shares related to the 2026 Notes
Denominator:
Antidilutive securities excluded from computation of earnings per share (in shares)			559	0

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