Long-term Debt - Convertible Senior Notes - Additional Information (Details)		1 Months Ended		12 Months Ended
	Dec. 11, 2019 $ / shares	Nov. 30, 2021 USD ($)	Dec. 31, 2019 USD ($) d $ / shares	Dec. 31, 2021 USD ($) d	Dec. 31, 2019 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Debt instrument, threshold trading days | d				5
Number of business day | d				5
Adjustments recorded in additional paid-in capital					$ 32,743,000
Long-term debt				$ 278,661,000			$ 54,556,000
Additional paid in capital				(351,422,000)			(423,759,000)
Accumulated deficit				362,484,000			314,666,000
Payment for capped call transactions			$ 10,100,000		10,126,000
Payment of 2019 Notes					28,192,000
Induced conversion expense related to convertible notes				11,333,000
ASU 2020-06 | Change in Accounting Method Accounted for as Change in Estimate | Revision of Prior Period, Accounting Standards Update, Adjustment
Debt Instrument [Line Items]
Long-term debt						$ 29,300,000
Additional paid in capital						32,700,000
Accumulated deficit						$ 3,400,000
2019 Convertible Senior Notes due 2026
Debt Instrument [Line Items]
Aggregate principal amount			$ 86,300,000		$ 86,300,000
Debt instrument, maturity date			Dec. 15, 2026
Net proceeds from issuing notes			$ 83,500,000
Debt instrument, borrowing interest rate percentage			9.90%		9.90%
Fair value of liability component upon issuance			$ 52,500,000		$ 52,500,000
Initial carrying amount of liability component recognized as debt discount			33,800,000		$ 33,800,000
Proceeds from convertible debt			86,300,000
Adjustments recorded in additional paid-in capital			33,800,000
Total issuance costs			2,800,000
Liability issuance costs			1,700,000
Equity issuance costs			$ 1,100,000
Cap price of the capped call transactions | $ / shares			$ 54.20
Premium percentage on sale price of common stock	100.00%
Common stock sale price per share last reported | $ / shares	$ 27.10
Capped call transactions expiration consecutive days | d			40
Capped call transaction expiring date	Dec. 11, 2026
2019 Convertible Senior Notes due 2026 | Level 2
Debt Instrument [Line Items]
Estimated fair value				26,200,000			$ 118,700,000
2019 Convertible Senior Notes due 2026 | 2019 Note Repurchase
Debt Instrument [Line Items]
Payment of 2019 Notes		$ 183,600,000
Repurchase of debt principal amount		76,400,000
Payment of 2019 Notes		183,600,000
Induced conversion expense related to convertible notes		11,300,000
Unamortized debt issuance costs		1,800,000
2021 Convertible Senior Notes due 2027
Debt Instrument [Line Items]
Aggregate principal amount		$ 287,500,000
Debt instrument, maturity date		May 15, 2027
Net proceeds from issuing notes		$ 278,400,000
Total issuance costs		$ 9,100,000
Accrued interest				494,000
2021 Convertible Senior Notes due 2027 | Level 2
Debt Instrument [Line Items]
Estimated fair value				$ 314,300,000
Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument, threshold consecutive trading days | d				30
Debt instrument, threshold percentage of stock price trigger				130.00%
Debt instrument, terms of conversion feature				Regardless of the foregoing circumstances, holders may convert all or any portion of the Notes, in increments of $1,000 principal amount, on or after September 15, 2026 (2019 Notes) and on or after February 15, 2027 (2021 Notes), until the close of business on the second scheduled trading day immediately preceding the maturity date.
Percentage of repurchase price of principal amount				100.00%
Convertible Senior Notes | Minimum
Debt Instrument [Line Items]
Debt instrument, threshold trading days | d				20
Convertible Senior Notes | Maximum
Debt Instrument [Line Items]
Debt instrument, threshold percentage of stock price trigger				98.00%