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Additional Information with Respect to Non-vested Options (Detail) - Employee Stock Option $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Weighted-average remaining contractual term | 7 years 5 months 12 days
Weighted-average remaining expected term | 2 years 5 months 12 days
Weighted-average remaining vesting period | 1 year 1 month 2 days
Unrecognized compensation cost | $ 673

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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