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Stock-Based Compensation - Summary of Changes in Unvested Options (Detail)	3 Months Ended
	Jun. 30, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, Granted | shares	6,250
Weighted-average exercise price, Beginning balance	$ 32.80
Weighted-average exercise price, Granted	3.12
Weighted-average exercise price, Exercised	0
Weighted-average exercise price, Cancelled (forfeited and expired)	10.10
Weighted-average exercise price, Ending balance	$ 135.64
Unvested Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, Beginning balance | shares	124,600
Number of options, Granted | shares	6,250
Number of options, Vested | shares	12,416
Number of options, Cancelled | shares	117,184
Number of options, Ending balance | shares	1,250
Weighted-average exercise price, Beginning balance	$ 7.91
Weighted-average exercise price, Granted	3.12
Weighted-average exercise price, Exercised	8.13
Weighted-average exercise price, Cancelled (forfeited and expired)	7.63
Weighted-average exercise price, Ending balance	8.52
Weighted-average grant date fair value, Beginning balance	5.18
Weighted-average grant date fair value, Granted	0
Weighted-average grant date fair value, Vested	5.28
Weighted-average grant date fair value, Cancelled	4.89
Weighted-average grant date fair value, Ending balance	$ 5.53

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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