Long-term Debt - Convertible Senior Notes - Additional Information (Details)		1 Months Ended			9 Months Ended
	Dec. 11, 2019 $ / shares	Jun. 30, 2022 USD ($)	Nov. 30, 2021 USD ($)	Dec. 31, 2019 USD ($) d $ / shares	Sep. 30, 2022 USD ($) d	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Jan. 01, 2021 USD ($)
Debt Instrument [Line Items]
Debt instrument, threshold trading days | d					5
Number of business day | d					5
Long-term debt					$ 279,846,000	$ 278,661,000
Additional paid in capital					(390,432,000)	(351,422,000)
Accumulated deficit					386,667,000	362,484,000
Payment for capped call transactions				$ 10,100,000
Induced conversion expense related to convertible notes					2,232,000
Unamortized debt issuance costs					7,654,000	9,056,000
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]
Debt instrument, maturity date				Dec. 15, 2026
Net proceeds from issuing notes				$ 83,500,000
Repurchase of debt principal amount			$ 76,400,000		9,850,000
Debt instrument, borrowing interest rate percentage				9.90%
Fair value of liability component upon issuance				$ 52,500,000
Initial carrying amount of liability component recognized as debt discount				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
Accrued interest							$ 508,000
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
Payment of 2019 Notes			183,600,000		17,600,000
Induced conversion expense related to convertible notes		$ 2,200,000	11,300,000
Unamortized debt issuance costs		199,000	1,800,000			217,000
2019 Convertible Senior Notes due 2026 | Level 2
Debt Instrument [Line Items]
Estimated fair value						26,200,000
2019 Convertible Senior Notes due 2026 | 2019 Note Repurchase
Debt Instrument [Line Items]
Payment of 2019 Notes		17,600,000	183,600,000
Repurchase of debt principal amount		9,850,000	$ 76,400,000
Unamortized debt issuance costs		$ 199,000				1,800,000
2019 Convertible Promissory Notes due 2026
Debt Instrument [Line Items]
Aggregate principal amount				$ 86,300,000
Debt instrument, maturity date				Dec. 15, 2026
2021 Convertible Senior Notes due 2027
Debt Instrument [Line Items]
Debt instrument, maturity date			May 15, 2027
Net proceeds from issuing notes			$ 278,400,000
Total issuance costs			9,100,000
Accrued interest					1,200,000
Unamortized debt issuance costs					7,654,000	8,839,000
2021 Convertible Senior Notes due 2027 | Level 2
Debt Instrument [Line Items]
Estimated fair value					$ 288,600,000	$ 314,300,000
2021 Convertible Promissory Notes due 2027
Debt Instrument [Line Items]
Aggregate principal amount			$ 287,500,000
Debt instrument, maturity date			May 15, 2027
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 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%