Warrants and Derivative Liabilities - Additional Information (Detail)			1 Months Ended	3 Months Ended
	Dec. 19, 2014 $ / shares shares	Apr. 04, 2012 shares	Oct. 31, 2013 $ / shares	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Apr. 29, 2015 $ / shares	Nov. 13, 2014 shares / pure $ / shares shares
Derivative [Line Items]
Gain (loss) in change of fair value of derivative instruments and warrants | $				$ (678,000)	$ 800,000
Hercules Warrants
Derivative [Line Items]
Gain (loss) in change of fair value of derivative instruments and warrants | $				(100,000)	0
November 2014 Warrant
Derivative [Line Items]
Warrant exercise price (in dollars per share) | $ / shares						$ 9.41
Gain (loss) in change of fair value of derivative instruments and warrants | $				$ (600,000)	700,000
Warrants expiration date				Nov. 13, 2019
Common stock units offered (in shares) | shares							909,090
Warrants to purchase one share of common stock							0.9
Number of warrants issued to purchase common stock (in shares) | shares							818,181
Sale of stock, price per share (in dollars per share) | $ / shares							$ 11.00
Capital Ventures International | Exchanged Warrants
Derivative [Line Items]
Gain (loss) in change of fair value of derivative instruments and warrants | $				$ 0	$ 100,000
Senior Convertible Note warrant | Capital Ventures International | Original Warrants
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock (in shares) | shares		309,406
Senior Convertible Note warrant | Capital Ventures International | Exchanged Warrants
Derivative [Line Items]
Warrant exercise, waiting period			6 months
Warrant exercise period			5 years
Warrant exercise price (in dollars per share) | $ / shares			$ 15.94
Senior Convertible Note warrant | Capital Ventures International | Maximum | Exchanged Warrants
Derivative [Line Items]
Beneficial ownership limitation percentage			4.99%
Beneficial ownership, limitation option, percentage			9.99%
Required notification period			61 days
Senior Secured Loan | Hercules Technology Growth Capital | Hercules Warrants
Derivative [Line Items]
Number of shares received from warrants received to purchase common stock (in shares) | shares	58,823
Warrant exercise price (in dollars per share) | $ / shares	$ 11.00					$ 9.41
Warrants expiration date				Jun. 30, 2020