Summary of Option Activity (Detail) - $ / shares shares in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Shares
Beginning Balance	1,924
Granted at fair market value	402
Exercised	(1)
Forfeited, cancelled, or expired	(322)
Ending Balance	2,003	1,924
Options exercisable at June 30, 2018	1,095
Vested options expired during the quarter ended June 30, 2018	191
Weighted Average Exercise Price
Beginning Balance	$ 8.62
Granted at fair market value	2.09
Exercised	2.10
Forfeited, cancelled, or expired	11.12
Ending Balance	6.91	$ 8.62
Options exercisable at June 30, 2018	8.75
Vested options expired during the quarter ended June 30, 2018	$ 14.29
Weighted Average Remaining Contractual Term (Years)
Options outstanding	6 years 1 month 20 days	7 years 2 months 15 days
Options exercisable	4 years 11 months 19 days

Share based compensation arrangement by share based payment award options grants in period at fair market value.

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Share based compensation arrangement by share based payment award options weighted average remaining contractual term.

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Share based compensation arrangement by share based payment award vested options expirations in period.

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Share based compensation arrangement by share based payment award vested options expirations in period weighted average exercise price.

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Share based compensation arrangements by share based payment award options grants in period weighted average exercise price at fair market value.

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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