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Debt Instrument Amount of Debt Exchanged Into a New Instrument

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Debt Instrument Covenant Compliance EBITDA Requirement

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Debt Instrument Covenant Compliance Minimum Liquidity

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Debt Instrument Interest Rate Stated Percentage Paid in Cash

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Debt Instrument Interest Rate Stated Percentage Paid in Kind

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Debt Instrument Interest Rate Stated Percentage Paid in Stock

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Debt Instrument Original Amount of Debt Refinanced

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Debt instrument, principal amount, redeemed.

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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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Face amount or stated value per share of common stock.

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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 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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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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

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

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

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Fair value amount of debt instrument that was repurchased.

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

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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

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

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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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Debt - Additional Information (Detail)					1 Months Ended							2 Months Ended	3 Months Ended			12 Months Ended
Debt - Additional Information (Detail)	Feb. 09, 2020	Aug. 09, 2019 USD ($)	Nov. 01, 2018 $ / shares	Jul. 26, 2018 USD ($)	Aug. 31, 2019 USD ($) $ / shares	Nov. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	Jun. 30, 2017 USD ($) shares	Jan. 31, 2016 USD ($)	Jun. 30, 2014 USD ($) $ / shares	Jul. 31, 2013 USD ($) $ / shares	Feb. 28, 2017 USD ($) shares	Dec. 31, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($) shares	Mar. 31, 2017 USD ($) shares	Dec. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)	Aug. 01, 2018 USD ($)	Jun. 14, 2018 USD ($)
Debt Instrument [Line Items]
Long term debt, face amount													$ 140,974,000			$ 52,658,000	$ 140,974,000
Payment for repurchase of convertible notes																0	0	$ 35,614,000
Gain recognized on retirement of debt																$ (13,205,000)	$ (453,000)	(611,000)
Common stock, par value (in dollars per share) \| $ / shares													$ 0.001			$ 0.001	$ 0.001
Change in fair value of convertible senior notes																$ (5,112,000)	$ 2,948,000	(308,000)
Convertible senior notes payable, fair value													$ 139,792,000			52,658,000	139,792,000
Debt issuance costs		$ 1,100,000																			$ 1,300,000
Amortization of debt discount																$ 1,077,000	0	0
4.25% Convertible Senior Notes Due 2018
Debt Instrument [Line Items]
Long term debt, face amount											$ 100,000,000.0
Debt instrument, interest rate				4.25%			4.25%				4.25%					4.25%
Debt instrument, conversion price (in dollars per share) \| $ / shares											$ 8.74
Debt instrument repurchase amount								$ 12,000,000						$ 12,000,000	$ 39,100,000				$ 6,100,000
Write-off of debt issuance costs														100,000					$ 100,000
Payment for repurchase of convertible notes								11,600,000							$ 24,100,000
Debt instrument shares common stock issued upon conversion (in shares) \| shares															2,900,000
Gain recognized on retirement of debt														100,000
Debt conversion ratio											0.1143674
Amortization of debt discount																$ 0	103,000	$ 844,000
4.25% Convertible Senior Notes Due 2018 \| Common Stock
Debt Instrument [Line Items]
Debt instrument repurchase amount								$ 11,600,000				$ 39,100,000		$ 11,600,000
Debt instrument shares common stock issued upon conversion (in shares) \| shares								112,400				2,865,000		112,400				3,000,000
3.25% Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Long term debt, face amount				$ 8,000,000.0									27,974,000			$ 0	27,974,000
Debt instrument, interest rate				3.25%												3.25%
Convertible senior notes payable, fair value													27,974,000			$ 0	27,974,000
Amortization of debt discount																0	0	$ 0
3.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Long term debt, face amount													0			$ 50,753,000	0
Debt instrument, interest rate				3.25%	3.25%											3.25%
Debt prepayment percentage					105.00%
Interest rate if paid in cash					3.25%
Interest rate if paid in stock					5.00%
Paid in kind interest rate					2.75%
Debt conversion ratio					1.00
Threshold percentage of stock price trigger					30.00%
Threshold percentage of market price trigger					150.00%
Percentage of ownership interest in joint venture					49.00%
Change in fair value of convertible senior notes																$ (2,500,000)	2,900,000	(300,000)
Convertible senior notes payable, fair value													0			50,753,000	0
Amortization of debt discount																0	0	0
4.875% Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Long term debt, face amount		113,000,000								$ 115,000,000			113,000,000			$ 1,905,000	113,000,000
Debt instrument, interest rate					4.875%					4.875%						4.875%
Debt instrument, conversion price (in dollars per share) \| $ / shares										$ 9.64
Debt instrument repurchase amount									$ 2,000,000
Write-off of debt issuance costs		700,000							100,000
Gain recognized on retirement of debt		2,400,000							$ 100,000
Debt conversion ratio										0.1037613
Convertible senior notes payable, fair value													111,818,000			$ 1,905,000	111,818,000
Fair value of debt outstanding		111,100,000											113,000,000			1,900,000	113,000,000
Debt refinanced, exchanged into similar debt instruments		103,800,000
Amount of accrued interest refinanced		1,000,000
Amount of debt exchanged into a new debt instrument		$ 7,300,000
Convertible senior note payable, fair value													93,200,000			1,700,000	93,200,000
Amortization of debt discount																460,000	789,000	$ 789,000
Oasis Management and Oasis Investments ll Master Fund Ltd. \| 4.25% Convertible Senior Notes Due 2018
Debt Instrument [Line Items]
Debt instrument, interest rate							4.25%
Oasis Management and Oasis Investments ll Master Fund Ltd. \| 3.25% Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Long term debt, face amount				$ 8,000,000			$ 21,600,000						29,600,000.0			0	29,600,000.0
Debt instrument, conversion price (in dollars per share) \| $ / shares			$ 2.54
Gain recognized on retirement of debt						$ (500,000)							(600,000)
Debt prepayment percentage			105.00%
Debt instrument, amount redeemed																				$ 13,200,000
Debt conversion ratio			0.3937008	0.3222688			0.3280302
Oasis Management and Oasis Investments ll Master Fund Ltd. \| After Modification Senior Notes (due 2018)
Debt Instrument [Line Items]
Long term debt, face amount							$ 21,600,000.0
Oasis Management and Oasis Investments ll Master Fund Ltd. \| 3.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Long term debt, face amount					$ 8,000,000.0								0			37,600,000	0
Gain recognized on retirement of debt					$ 10,400,000
Common stock, par value (in dollars per share) \| $ / shares					$ 0.001
Change in fair value of convertible senior notes																2,600,000
Secured Debt \| New Term Loan Agreement
Debt Instrument [Line Items]
Debt instrument, interest rate		10.50%
Interest rate if paid in cash		8.00%
Paid in kind interest rate		2.50%
Fair value of debt outstanding													$ 0			134,801,000	$ 0
Line of credit facility maximum borrowing capacity		$ 134,800,000
Covenant, EBITDA requirement		34,000,000
Minimum liquidity requirement		10,000,000
Debt issuance costs		3,800,000
Amortization of debt discount																400,000
Secured Debt \| 2019 New Term Loan Agreement
Debt Instrument [Line Items]
Debt issuance costs		$ 10,100,000
Amortization of debt discount																$ 1,100,000
Subsequent Event \| 3.25% Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Debt conversion ratio	1.00