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Common Stock - Authorized - Additional Information (Detail) - $ / shares | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Common stock, shares authorized | 150,000,000 | 150,000,000
Common stock, par value | $ 0.001 | $ 0.001
Preferred stock, shares authorized | 5,000,000 | 5,000,000
Preferred stock, par value | $ 0.001 | $ 0.001

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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