Capped call transaction expiring date.

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Capped call transactions expire over scheduled number of trading days.

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Debt instrument borrowing interest rate percentage.

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Debt instrument capped call transaction cap price per share.

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Debt instrument convertible common stock conversion shares per 1000 principal amount of notes.

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Debt instrument interest rate effective percentage on liability component

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Number of business days in conversion condition.

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Premiums paid for capped call transactions.

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Sale of stock premium over last reported sale price percentage.

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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The value of the stock converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Description of the conversion terms of a debt instrument which may include the conversion ratio (including all potential conversion ratios if contingently adjustable), type of debt or equity security into which the debt is convertible, the dollars of debt or the number of shares into which the instrument is convertible (or potentially convertible into), the conversion period, any contingencies associated with the conversion terms, and the existence and amount of a beneficial conversion feature.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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Face (par) amount of debt instrument at time of issuance.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Percentage of principal amount of debt redeemed.

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Amount, after accumulated amortization, of debt discount.

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The total of the cash outflow during the period which has been paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and the cost incurred directly for the issuance of equity securities.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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Long-term Debt - Convertible Senior Notes - Additional Information (Details) $ / shares in Units, $ in Thousands		1 Months Ended	12 Months Ended
	Dec. 11, 2019 $ / shares	Dec. 31, 2019 USD ($) d $ / shares shares	Dec. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares
Debt Instrument [Line Items]
Net proceeds from issuing notes				$ 83,475
Debt instrument, threshold trading days \| d		5
Number of business day \| d		5
Adjustments recorded in additional paid-in capital				32,743
Conversion value of common stock			$ 18,300
Common stock sale price per share last reported \| $ / shares			$ 41.87
Payment for capped call transactions		$ 10,100		10,126
2019 Convertible Senior Notes due 2026
Debt Instrument [Line Items]
Aggregate principal amount		$ 86,300		$ 86,300
Debt instrument, Interest rate		2.00%		2.00%
Debt instrument, maturity date		Dec. 15, 2026
Debt Instrument, frequency of periodic payment			The 2019 Notes accrue interest at a fixed rate of 2.00% per year, payable semi-annually in arrears on June 15 and December 15 of each year, beginning June 15, 2020.
Net proceeds from issuing notes		$ 83,500
Debt instrument convertible common stock conversion shares per 1000 principal amount of notes \| shares		28.9415
Debt instrument, initial conversion ratio		0.0289415
Debt instrument, initial conversion price \| $ / shares		$ 34.55		$ 34.55
Debt instrument, threshold consecutive trading days \| d		30
Debt instrument, threshold percentage of stock price trigger		130.00%
Debt instrument, terms of conversion feature			On or after September 15, 2026, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of the 2019 Notes, in multiples of $1,000 principal amount, at the option of the holder regardless of the foregoing circumstances.
Percentage of repurchase price of principal amount		100.00%
Debt instrument, borrowing interest rate percentage		9.90%		9.90%
Fair value of liability component upon issuance		$ 52,500		$ 52,500
Initial carrying amount of liability component recognized as debt discount		33,800		33,800
Proceeds from convertible debt		86,300
Adjustments recorded in additional paid-in capital		33,800
Common stock sale price per share last reported \| $ / shares	$ 27.10
Total issuance cost allocated between liability and equity		2,800
Liability issuance costs		1,700
Equity issuance costs		$ 1,100
Effective interest rate on the liability component			10.21%
Cap price of the capped call transactions \| $ / shares		$ 54.20
Premium percentage on sale price of common stock	100.00%
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		$ 87,000	$ 118,700	$ 87,000
2019 Convertible Senior Notes due 2026 \| Minimum
Debt Instrument [Line Items]
Debt instrument, threshold trading days \| d		20
2019 Convertible Senior Notes due 2026 \| Maximum
Debt Instrument [Line Items]
Debt instrument, threshold percentage of stock price trigger		98.00%