The Company - Additional Information (Detail)						1 Months Ended			12 Months Ended
	Mar. 21, 2016 USD ($)	Sep. 28, 2015 USD ($) shares	Oct. 27, 2014 USD ($) $ / shares shares	Feb. 23, 2012 USD ($) $ / shares shares	Oct. 31, 2009 $ / shares shares	Mar. 23, 2016 USD ($)	Oct. 31, 2014 shares	Mar. 31, 2014 $ / shares shares	Dec. 31, 2015 USD ($) Segment shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Sep. 30, 2015 USD ($)
Product Information [Line Items]
Business incorporation, state country name									State of Delaware
Business incorporation, date									Dec. 19, 2000
Number of business segment | Segment									1
Common stock shares issued | shares									19,577,729	19,404,697
Number of common shares, callable by warrants issued in the aggregate stock and warrants sale | shares								345,661	345,661
Exercise price of warrant | $ / shares								$ 0.01
Warrant expiration date								May 31, 2019
Proceeds from financing obligations | $									$ 2,914,000	$ 50,830,000	$ 15,000,000
Common Stock [Member]
Product Information [Line Items]
Common stock shares issued during the period | shares									125,000	2,000,000	1,437,481
Ferrer Note [Member]
Product Information [Line Items]
Common stock shares issued | shares		125,000
Proceeds from financing obligations | $		$ 3,000,000
Additional tranche to borrow | $												$ 1,000,000
Debt instrument interest rate		6.00%
Promissory note, due date		May 31, 2016
Ferrer Note [Member] | Common Stock [Member]
Product Information [Line Items]
Common stock shares issued during the period | shares		125,000
Ferrer Note [Member] | Maximum [Member]
Product Information [Line Items]
Principal amount of promissory note | $												$ 5,000,000
Ferrer Note [Member] | Subsequent Event [Member]
Product Information [Line Items]
Proceeds from financing obligations | $	$ 1,000,000					$ 1,000,000
Principal amount of the Ferrer Note outstanding | $						$ 4,000,000
Ferrer Promissory Note Initial Tranche [Member]
Product Information [Line Items]
Proceeds from promissory note | $		$ 3,000,000
Ferrer Promissory Note Tranche Two [Member]
Product Information [Line Items]
Promissory note, due date		May 31, 2016
Ferrer Promissory Note Tranche Two [Member] | Subsequent Event [Member]
Product Information [Line Items]
Proceeds from financing obligations | $	$ 1,000,000
Grupo Ferrer Internacional, S.A. [Member]
Product Information [Line Items]
Common stock shares issued during the period | shares							2,000,000
Underwritten Public Offering [Member]
Product Information [Line Items]
Common stock shares issued | shares				4,400,000
Number of common shares, callable by warrants issued in the aggregate stock and warrants sale | shares				4,400,000
Net proceeds received in the aggregate stock and warrants sale | $				$ 20,231,000
Exercise price of warrant | $ / shares				$ 5.00
Warrant expiration date				Feb. 23, 2017
Date from which warrants are exercisable				Feb. 24, 2013
Private Placement [Member]
Product Information [Line Items]
Common stock shares issued | shares					8,107,012
Number of common shares, callable by warrants issued in the aggregate stock and warrants sale | shares					7,296,312
Exercise price of warrant | $ / shares					$ 2.77
Warrant expiration date					Oct. 31, 2016
Private Placement [Member] | Grupo Ferrer Internacional, S.A. [Member]
Product Information [Line Items]
Amount of consideration received by company in exchange for shares sold in transaction | $			$ 8,000,000
Sale of stock, number of shares issued in transaction | shares			2,000,000
Common stock average price per share | $ / shares			$ 4.00
Premium on the fair value from sale of stock, classified as deferred revenue | $			$ 2,400,000