Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Net Loss Per Share - Summary of Antidilutive Securities Excluded From Computation Diluted Weighted Average Shares Outstanding (Detail)	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2018 day	Dec. 31, 2020 day	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)			14,276,017	11,225,725	12,113,439
Unvested Restricted Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)			0	0	21,677
Unvested Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)			2,941,914	2,936,924	2,773,773
Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)			101,658	53,167	74,634
Convertible Senior Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)			9,299,432	5,530,176	5,530,176
Options to Purchase Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share amount (in shares)			1,933,013	2,705,458	3,713,179
Convertible Debt \| Debt Covenant Three
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Threshold percentage of stock price trigger	130.00%
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 Senior Notes
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
2023 Notes \| Convertible Debt \| Debt Covenant Three
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Threshold trading days \| day	20
Threshold consecutive trading days \| day	30
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 Senior Notes
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
The Notes \| Convertible Debt \| Debt Covenant Three
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