Subsequent Events - Additional Information (Detail)						1 Months Ended	3 Months Ended
	May. 11, 2016 USD ($)	May. 09, 2016 USD ($) $ / shares Contingentpayment	Apr. 15, 2016 USD ($)	Mar. 21, 2016 USD ($)	Sep. 28, 2015 USD ($)	May. 11, 2016 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)
Subsequent Event [Line Items]
Proceeds from financing obligations							$ 1,000,000	$ 0
Subsequent Event
Subsequent Event [Line Items]
Merger agreement share price | $ / shares		$ 0.90
Contractual contingent value right, number of rights for each outstanding share of common stock		1
Number of contingent payments, rights to receive | Contingentpayment		4
Business Acquisition, Equity Interest Issued or Issuable, Description		In addition, in connection with the transactions contemplated by the Merger Agreement, the vesting of all our unvested options and unvested restricted stock units will be accelerated to be vested in full and, with respect to the options, immediately exercisable at least six days prior to the closing of the Offer. Any options that are not exercised prior to the closing of the Offer will be cancelled. Additionally, pursuant to the terms of the Merger Agreement, (i) each holder of a warrant originally issued by us on October 5, 2009 or February 23, 2012 will receive a lump-sum cash payment equal to (A) the total number of shares of our common stock issuable to such holder upon the exercise of the applicable warrant, multiplied by (B) the value of such warrant to purchase one share of our common stock, calculated in accordance with Appendix B of such warrant; and (ii) each holder of the 2014 Warrants will receive (A) a lump-sum cash payment equal to (1) the total number of shares of our common stock issuable to such holder upon the exercise of the applicable warrant, multiplied by (2) the excess of (x) the Cash Consideration over (y) the per-share exercise price for such warrant and (B) one CVR for each share of our common stock underlying such warrant
Subsequent Event | Ferrer and Purchaser [Member]
Subsequent Event [Line Items]
Merger agreement date		May 09, 2016
Termination fee		$ 1,000,000
Subsequent Event | Maximum [Member]
Subsequent Event [Line Items]
Merger agreement transaction amount		$ 35,000,000
Subsequent Event | Minimum [Member] | Ferrer and Purchaser [Member]
Subsequent Event [Line Items]
Percentage of outstanding voting securities		10.00%
Ferrer Note [Member]
Subsequent Event [Line Items]
Proceeds from financing obligations				$ 1,000,000	$ 3,000,000
Ferrer Note [Member] | Maximum [Member]
Subsequent Event [Line Items]
Principal amount of promissory note									$ 5,000,000
Ferrer Note [Member] | Subsequent Event
Subsequent Event [Line Items]
Proceeds from financing obligations	$ 1,300,000		$ 1,000,000
Principal amount of the Ferrer Note outstanding	$ 6,300,000	$ 6,300,000				$ 6,300,000
Ferrer Note [Member] | Subsequent Event | Maximum [Member]
Subsequent Event [Line Items]
Principal amount of promissory note		$ 6,300,000
Ferrer Promissory Note Tranche Two [Member]
Subsequent Event [Line Items]
Promissory note, due date					May 31, 2016
Ferrer Promissory Note Tranche Two [Member] | Subsequent Event
Subsequent Event [Line Items]
Proceeds from financing obligations						$ 2,300,000
Promissory note, due date		Sep. 30, 2016