Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended		9 Months Ended
	Dec. 31, 2014	Apr. 30, 2014	Mar. 31, 2016	Mar. 31, 2015
Class of Stock [Line Items]
Public float maximum market value		$ 75,000,000
Aggregate value of securities available under shelf registration statement			$ 104,000,000
Market value of non-affiliated public float			The market value of the Company's non-affiliated public float was less than $75 million as of March 31, 2016. Accordingly, until the Company's non-affiliated public float exceeds $75 million, the Company may not sell shares with a market value greater than one-third of its non-affiliated public float during any 12-month period under the shelf registration statement.
Issuance of common stock (in shares)			0
Net proceeds from issuance of common stock				$ 43,070,000
Series A warrants
Class of Stock [Line Items]
Warrants outstanding			215,721
Exercise price			$ 6.00
Warrants expiration date			2016-11
Maximum
Class of Stock [Line Items]
Sale of shares and warrants under agreement		$ 150,000,000
Rights Offering
Class of Stock [Line Items]
Warrants outstanding			315,484
Exercise price			$ 7.14
Warrants expiration date			2017-05
Underwritten Registered Offering
Class of Stock [Line Items]
Issuance of common stock (in shares)	11,500,000
Common stock, sales price per share	$ 4.00
Net proceeds from issuance of common stock	$ 43,100,000
Payment of stock offering cost	$ 2,900,000
December 2012 Private Placement
Class of Stock [Line Items]
Warrants outstanding			3,230,202
Exercise price			$ 3.12
Warrants expiration date			2017-12