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Debt - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt conversion, converted instrument, shares issued (in shares)	472,356
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Equity component of the convertible notes	$ 2,640	$ 2,661
Loss on exchange of convertible debt		300
Additional Paid-In Capital
Debt Instrument [Line Items]
Equity component of the convertible notes	2,635	2,656
Common Stock
Debt Instrument [Line Items]
Equity component of the convertible notes	5	$ 5
Convertible Senior Notes 2016, Due 2023 | Convertible Notes
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount	$ 2,800

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Gain (Loss) On Exchange Of Debt

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Face amount or stated value per share of common stock.

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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

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