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Stock-Based Compensation - Additional Information (Detail)			1 Months Ended			3 Months Ended				9 Months Ended
	Apr. 08, 2015 USD ($) Director shares	Mar. 12, 2015 USD ($) Director shares	May. 31, 2015 USD ($) Director shares	Jan. 31, 2015 shares	Jan. 31, 2014 shares	Sep. 30, 2015 USD ($) shares	Mar. 31, 2015 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost | $						$ 3,131,000				$ 3,131,000
Unvested option						914,812				914,812
Unrecognized compensation cost, recognition period										1 year 9 months 4 days
Weighted-average grant-date fair values of options granted | $ / shares										$ 2.60	$ 10.75
Number of options granted				304,000						454,000
Number of options vested										76,000
Stock-based compensation expense | $						$ 793,000		$ 877,000		$ 2,527,000	$ 3,271,000
Options vesting over 3 years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested option						228,000				228,000
Consultant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense | $									$ 25,000
Common stock options granted, shares					3,000
Fair market value of shares | $									$ 25,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period										3 years
Stock-based compensation expense | $							$ 173,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted	177,618	81,352								337,935
Non-cash stock-based compensation expense to be recognized | $	$ 0
Restricted stock awards cancelled	222,615
Restricted Stock | Non Employees Seven Board Of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted		77,784
Number of non-employee directors | Director		7
Non-cash stock-based compensation expense to be recognized | $		$ 280,000
Share based compensation, cliff vest in full date		May 20, 2016
Restricted Stock | Non Employees Two Board Of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted		3,568
Number of non-employee directors | Director		2
Non-cash stock-based compensation expense to be recognized | $		$ 12,845
Share based compensation, cliff vest in full date		May 21, 2015
Restricted Stock | Non Employee Board Of Directors Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted	71,378
Number of non-employee directors | Director	1
Non-cash stock-based compensation expense to be recognized | $	$ 236,975
Share based compensation, cliff vest in full date	May 20, 2016
Restricted Stock | Non Employee Board Of Directors Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted	7,587		7,587
Number of non-employee directors | Director	4		4
Non-cash stock-based compensation expense to be recognized | $	$ 23,500		$ 23,500
Share based compensation, cliff vest in full date	May 20, 2016		May 20, 2016

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