Number of Total Trading Days.

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Number of Trading Days Considered.

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Percentage of Conversion Price.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The gross value of stock issued during the period upon the conversion of convertible securities.

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The net amount of stock issued during the period upon the conversion of convertible securities, net of adjustments (for example, to additional paid in capital) including the write-off of an equity component recognized to record the convertible debt instrument as two separate components - a debt component and an equity component. This item is meant to disclose the value of shares issued on conversion of convertible securities that were recorded as two separate (debt and equity) components.

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Borrowings - Convertible Senior Notes (Details) $ in Thousands		12 Months Ended
	Sep. 23, 2019 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Aggregate principal amount		$ 80,500
Issuance costs		2,382
Provision for (benefit from) income taxes		184	$ (79)	$ 101
Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 80,500
Interest rate (as percentage)	4.25%
Implied estimated effective rate	12.30%
Number of shares per $1,000 principal amount of Notes \| shares	83.3021
Equity component carrying amount		22,600
Issuance cost, gross		$ 21,600
Scenario, One [Member] \| Convertible Notes Payable [Member] \| Minimum
Debt Instrument [Line Items]
Number of trading days	20 days
Percentage of conversion price	130
Scenario, One [Member] \| Convertible Notes Payable [Member] \| Maximum
Debt Instrument [Line Items]
Total number of trading days	30 days
Scenario, Two [Member] \| Convertible Notes Payable [Member]
Debt Instrument [Line Items]
Total number of trading days	10 days
Scenario, Two [Member] \| Convertible Notes Payable [Member] \| Minimum
Debt Instrument [Line Items]
Number of trading days	5 days
Scenario, Two [Member] \| Convertible Notes Payable [Member] \| Maximum
Debt Instrument [Line Items]
Percentage of conversion price	98