Debt instrument default period.

No definition available.

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- Definition

Debt instrument repurchase description.

+ References

No definition available.

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- Definition

Percentage Of Holding In Debt

+ References

No definition available.

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- Definition

Principal amount used in debt instrument convertible conversion ratio.

+ References

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.

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- Definition

A unique description of a noncash or part noncash stock conversion. The description would be expected to include sufficient information to provide an understanding of the nature and purpose of the conversion. 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

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

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Period Type:	instant

- Definition

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

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- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

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- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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- Definition

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

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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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.

+ References

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- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

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- Definition

Description of debt redemption features under terms of the debt agreement.

+ References

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- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

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- Definition

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

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Debt - 2021 Convertible Notes - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($) d $ / shares	Dec. 31, 2015 USD ($)	Aug. 31, 2016 USD ($)	Aug. 30, 2016 USD ($)	Aug. 05, 2016 USD ($)	Mar. 31, 2015 USD ($)
Debt Instrument [Line Items]
Interest expense	$ 1,418,000	$ 1,230,000
Over-Allotment Option [Member]
Debt Instrument [Line Items]
Debt instrument principal amount			$ 2,000,000			$ 1,000,000
2021 Convertible Notes [Member]
Debt Instrument [Line Items]
Debt issuance costs incurred	$ 3,262,000
2021 Convertible Notes [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument principal amount			$ 52,000,000		$ 50,000,000
Debt instrument maturity date	Aug. 01, 2021
Debt instrument payment terms	Semi-annually
Convertible senior notes, interest rate, stated percentage	5.75%		5.75%
Debt instrument payment start date	Feb. 01, 2017
Debt issuance costs incurred	$ 3,262,000
Number of shares, note gets converted into	124.7505
Principal amount	$ 1
Debt instrument redemption description	The Company, at its option, may redeem for cash all or any portion of the 2021 Convertible Notes if the last reported sale price of a share of the Company’s common stock is equal to or greater than 200% of the conversion price for the 2021 Convertible Notes then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period (including the last trading day of such period) ending within the five trading days immediately preceding the date on which the Company provides notice of redemption, at a redemption price equal to 100% of the principal amount of the 2021 Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date.
Percentage of common stock conversion price	200.00%
Number of minimum trading days \| d	20
Number of consecutive trading days	30 days
Holdings in debt outstanding	25.00%
Number of days after default	180 days
Effective interest rate	7.30%
Interest expense	$ 1,418,000
Amortization of debt discount	$ 222,000
2021 Convertible Notes [Member] \| Senior Notes [Member] \| First 90 Days [Member]
Debt Instrument [Line Items]
Effective interest rate	0.25%
2021 Convertible Notes [Member] \| Senior Notes [Member] \| 91 to 180 Days [Member]
Debt Instrument [Line Items]
Effective interest rate	0.50%
2021 Convertible Notes [Member] \| Senior Notes [Member] \| Over-Allotment Option [Member]
Debt Instrument [Line Items]
Debt instrument principal amount				$ 2,000,000
2021 Convertible Notes [Member] \| Fundamental Change [Member]
Debt Instrument [Line Items]
Principal amount	$ 1
Conversion of stock, description	If the Stock Price applicable to any conversion is greater than $40.00 per share, the Conversion Rate will not be increased. If the Stock Price applicable to any conversion is less than $6.68 per share, the Conversion Rate in connection with a Make-Whole Fundamental Change Conversion will not be increased but it will be increased by 24.95 shares in connection with a Voluntary Conversion.
Debt instrument repurchase description	Upon the occurrence of a Fundamental Change, the occurrence of certain change of control transactions or delisting events (as defined in the Indenture), each Holder may require the Company to repurchase for cash all or any portion of the 2021 Convertible Notes held by such Holder at a repurchase price equal to 100% of the principal amount thereof, plus accrued and unpaid interest thereon.
Percentage of principal amount of notes to be purchased	100.00%
2021 Convertible Notes [Member] \| Fundamental Change [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Number of shares, note gets converted into	0
Debt Instrument, conversion rate \| $ / shares	$ 40.00
2021 Convertible Notes [Member] \| Fundamental Change [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Number of shares, note gets converted into	24.95
Debt Instrument, conversion rate \| $ / shares	$ 6.68