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Stockholders' Equity - Stock-based Compensation Expense and Valuation Information - Additional Information (Detail) | 12 Months Ended
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Mar. 31, 2017 USD ($)
Class Of Stock [Line Items] |
Total unrecognized compensation cost related to unvested stock option grants | $ 10,271,000
Stock options [Member] |
Class Of Stock [Line Items] |
Total unrecognized compensation cost related, weighted average period | 2 years 2 months 12 days
Restricted stock units (RSUs) [Member] |
Class Of Stock [Line Items] |
Total unrecognized compensation cost related, weighted average period | 2 years 10 months 10 days
Unrecognized stock-based compensation expense | $ 3,557,000
Restricted stock [Member] |
Class Of Stock [Line Items] |
Unrecognized stock-based compensation expense | $ 0

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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