Debt Instrument, Convertible, Number Of Share

No definition available.

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- Definition

Debt instrument, principal amount, redeemed.

+ References

No definition available.

+ Details

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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- Definition

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.

+ References

No definition available.

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- Definition

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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- Definition

The amount of 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 cash payments in the period.

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- Definition

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

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- Definition

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

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- Definition

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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- Definition

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

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- Definition

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

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- Definition

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

+ References

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- Definition

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.

+ References

No definition available.

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- Definition

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

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

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- Definition

The cash outflow from the repayment 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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- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Convertible Senior Notes - Additional Information (Detail) $ / shares in Units, $ in Thousands			1 Months Ended					3 Months Ended			9 Months Ended		12 Months Ended
	Nov. 01, 2018 $ / shares	Jul. 26, 2018 USD ($)	Aug. 31, 2017 USD ($) shares	Jun. 30, 2017 USD ($) shares	Jan. 31, 2016 USD ($)	Jun. 30, 2014 USD ($) $ / shares shares	Jul. 31, 2013 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($) shares	Mar. 31, 2017 USD ($) shares	Sep. 30, 2018 USD ($) shares	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Aug. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Amortization of debt issuance costs recognized as interest expense								$ 200	$ 400		$ 700	$ 1,500
Long term debt, face amount								146,436			146,436					$ 156,647
Gain recognized on retirement of debt								(453)			(453)	114
Payment for repurchase of convertible notes												35,614
Unrealized loss related to a fair market value adjustment								917			(2,514)
4.875% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount						$ 115,000		$ 113,000			$ 113,000					$ 113,000
Debt instrument, interest rate						4.875%		4.875%			4.875%					4.875%
Debt instrument, maturity date						Jun. 01, 2020
Frequency of interest payment											semi-annually
Conversion rate in share per $1000 principal amount of notes \| shares						103.7613
Debt instrument, conversion rate \| $ / shares						$ 9.64
Write-off of debt issuance costs					$ 100
Debt instrument repurchase amount					2,000
Gain recognized on retirement of debt					$ 100
Convertible senior note payable, fair value								$ 97,300			$ 97,300			$ 89,700
4.25% Convertible Senior Notes (due 2018)
Debt Instrument [Line Items]
Long term debt, face amount							$ 100,000									$ 21,178
Debt instrument, interest rate		4.25%					4.25%	4.25%			4.25%					4.25%
Debt instrument, maturity date		Aug. 01, 2018					Aug. 01, 2018
Frequency of interest payment											semi-annually
Conversion rate in share per $1000 principal amount of notes \| shares							114.3674
Debt instrument, conversion rate \| $ / shares							$ 8.74
Write-off of debt issuance costs									100				$ 100
Debt instrument repurchase amount									12,000	$ 39,100		$ 12,000	$ 6,100
Gain recognized on retirement of debt									100
Payment for repurchase of convertible notes									$ 11,600	$ 24,100
Debt amount converted		$ 8,000
4.25% Convertible Senior Notes (due 2018) \| Common Stock
Debt Instrument [Line Items]
Debt instrument repurchase amount				$ 11,600				$ 39,100			$ 39,100
Debt instrument shares common stock issued upon conversion \| shares				112,400					112,400	2,900,000	2,865,000
3.25% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount		$ 8,000						$ 33,436			$ 33,436					$ 22,469
Debt instrument, interest rate		3.25%						3.25%			3.25%					3.25%
Debt instrument, maturity date		Nov. 01, 2020
Gain recognized on retirement of debt		$ 500
Conversion rate in share per $1000 principal amount of notes		322.2688
3.25% Convertible Senior Notes (due 2020) \| Subsequent Event
Debt Instrument [Line Items]
Debt instrument, conversion rate \| $ / shares	$ 2.54
Debt conversion price, percentage	105.00%
Debt instrument, convertible, terms of conversion	The conversion price for the 3.25% convertible senior notes will be reset on November 1, 2018 and November 1, 2019 (each, a “reset date”) to a price equal to 105% above the 5-day VWAP preceding the reset date; provided, however, among other reset restrictions, that if the conversion price resulting from such reset is lower than 90 percent of the average VWAP during the 90 calendar days preceding the reset date, then the reset price shall be the 30-day VWAP preceding the reset date. The conversion price reset on November 1, 2018 to $2.54 per share.
3.25% Convertible Senior Notes (due 2020) \| Oasis Management and Oasis Investments ll Master Fund Ltd.
Debt Instrument [Line Items]
Long term debt, face amount			$ 21,500
Debt instrument, interest rate			3.25%
Debt instrument, maturity date			Nov. 01, 2020
Conversion rate in share per $1000 principal amount of notes \| shares			328.0302
Gain recognized on retirement of debt											$ 600
Unrealized loss related to a fair market value adjustment								$ 900			(2,500)
Convertible senior note payable, fair value								$ 33,400			$ 33,400					$ 22,500
Debt instrument, amount redeemed															$ 13,200