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- Definition

Debt Instrument, Unamortized Discount, Gross

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- Definition

Debt instrument, Drawn Amount

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Line Of Credit Facility, Percentage Of Fee For Amounts Drawn

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- Definition

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "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

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

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- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

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- Definition

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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- Definition

Consideration given by issuer of convertible debt to provide an incentive for debt holders to convert the debt to equity securities. The expense is equal to the fair value of all securities and other consideration transferred in the transaction in excess of the fair value of securities issuable pursuant to the original conversion terms.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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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 fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Debt - Additional Information (Detail) - USD ($)		3 Months Ended		9 Months Ended
Debt - Additional Information (Detail) - USD ($)	Jul. 23, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Sep. 30, 2014
Debt Instrument [Line Items]
Aggregate amount of senior notes issued						$ 125,000,000
Induced conversion, expense recognized		$ 24,100,000
Funds withdrawn at closing	$ 0	0		$ 0
Convertible notes
Debt Instrument [Line Items]
Debt instrument, interest rate percentage							1.75%
Interest expense related to convertible notes		800,000	$ 600,000	1,700,000	$ 1,800,000
2014 Notes \| Convertible notes
Debt Instrument [Line Items]
Aggregate amount of senior notes issued						$ 125,000,000	$ 125,000,000
Unamortized discount, gross		$ (2,100,000)		$ (2,100,000)
Common stock \| 2014 Notes
Debt Instrument [Line Items]
Shares converted (in shares)	5,040,323
Additional shares converted (in shares)	329,124
Revolving Credit Facility \| Delayed Draw Term Loan
Debt Instrument [Line Items]
Debt instrument, interest rate percentage	8.625%
Maximum borrowing capacity	$ 100,000,000
Percentage of fees upon drawdown of amounts drawn	1.75%
Percentage of annual fees on undrawn amount	1.50%
One-time termination fee amount	$ 1,500,000