Summary of Option Activity (Detail) - $ / shares shares in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Beginning Balance	1,623	1,347	1,322
Granted at fair market value	90	611	446
Exercised	(2)	(1)
Forfeited, cancelled, or expired	(424)	(334)	(421)
Ending Balance	1,287	1,623	1,347
Options exercisable, December 31, 2019	1,033
Vested options expired during the twelve months ended December 31, 2019	224
Weighted-Average Exercise Price Per Share
Beginning Balance	$ 6.54	$ 8.99	$ 13.60
Granted at fair market value	1.74	1.98	5.15
Exercised	2.10	2.10	4.30
Forfeited, cancelled, or expired	9.43	10.68	9.15
Ending Balance	5.77	$ 6.54	$ 8.99
Options exercisable, December 31, 2019	6.58
Vested options expired during the twelve months ended December 31, 2019	$ 9.91

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

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