Debt Instrument, Convertible, Number Of Share

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Period Type:	duration

- 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.

+ Details

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Balance Type:	credit
Period Type:	instant

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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+ Details

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Balance Type:	na
Period Type:	instant

- 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.

+ Details

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Period Type:	duration

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ Details

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 230
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-Section 45
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Balance Type:	credit
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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Convertible Senior Notes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended					3 Months Ended			12 Months Ended
	Aug. 31, 2017	Jun. 30, 2017	Jan. 31, 2016	Jun. 30, 2014	Jul. 31, 2013	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Debt Instrument [Line Items]
Amortization of debt issuance costs recognized as interest expense						$ 200		$ 300
Long term debt, face amount						157,668				$ 156,647
Payment for repurchase of convertible notes								24,052
Unrealized loss related to a fair market value adjustment						(1,021)
4.875% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount				$ 115,000		$ 113,000				$ 113,000
Debt instrument, interest rate				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				103.7613
Debt instrument, conversion rate				$ 9.64
Debt instrument repurchase amount			$ 2,000
Write-off of debt issuance costs			100
Gain recognized on retirement of debt			$ 100
4.25% Convertible Senior Notes (due 2018)
Debt Instrument [Line Items]
Long term debt, face amount					$ 100,000	$ 21,178				$ 21,178
Debt instrument, interest rate					4.25%	4.25%				4.25%
Debt instrument, maturity date					Aug. 01, 2018	Jun. 15, 2018
Frequency of interest payment						semi-annually
Conversion rate in share per $1000 principal amount of notes					114.3674
Debt instrument, conversion rate					$ 8.74
Debt instrument repurchase amount		$ 12,000					$ 12,000	39,100	$ 6,100
Write-off of debt issuance costs							100		$ 100
Gain recognized on retirement of debt							100
Payment for repurchase of convertible notes							11,600	24,100
4.25% Convertible Senior Notes (due 2018) \| Common Stock
Debt Instrument [Line Items]
Debt instrument repurchase amount		$ 11,600					$ 11,600	$ 39,100
Debt instrument shares common stock issued upon conversion		112,400					112,400	2,865,000
3.25% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Long term debt, face amount						$ 23,490				$ 22,469
Debt instrument, interest rate						3.25%				3.25%
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	328.0302
Gain recognized on retirement of debt						$ 600
Unrealized loss related to a fair market value adjustment						(1,000)
Convertible senior note payable, fair value						$ 23,500				$ 22,500