Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity - Additional Information (Detail)

Shareholders' Equity - Additional Information (Detail)											12 Months Ended
Shareholders' Equity - Additional Information (Detail)	Dec. 31, 2016 shares	Dec. 29, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($) Investor $ / shares shares	Jun. 06, 2016 Installments $ / shares shares	Feb. 15, 2016 shares	Dec. 01, 2015 shares	Aug. 03, 2015 shares	Mar. 23, 2015 $ / shares shares	Mar. 16, 2015 shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Jan. 31, 2017 shares	Sep. 15, 2016	Sep. 14, 2016	Jun. 09, 2015	Dec. 31, 2014 shares
Class of Stock [Line Items]
Number of authorized shares of all classes of our capital stock	120,000,000										120,000,000
Number of authorized shares of common stock	100,000,000										100,000,000	100,000,000
Cash received from related parties \| $											$ 250,000
Recognized compensation expense relating to restricted stock awards \| $											$ 151,200	$ 264,000
Stock option awards											725,250	928,500
Exercise price of plan \| $ / shares											$ 0.69	$ 1.31
Shares underlying warrant outstanding									2,170,925
Warrants exercisable price per share \| $ / shares									$ 2.00
Warrants Outstanding	175,584										175,584
Number of stock options outstanding	1,621,523										1,621,523	1,471,031					820,865
Total number of outstanding common shares if all warrant and stock options were exercised	50,911,326
Convertible Promissory Note [Member] \| Principal Owner [Member]
Class of Stock [Line Items]
Interest rate																3.00%
Common stock issued in connection with conversion of convertible promissory note							3,381,004
Conversion price of note, per share \| $ / shares												$ 1.50
Non-employee Directors [Member] \| 2012 Equity Incentive Plan [Member] \| Restricted Stock [Member]
Class of Stock [Line Items]
Restricted shares awarded to each non-employee director						40,000				40,000
Restricted shares vested for each non-employee director											40,000	40,000
Recognized compensation expense relating to restricted stock awards \| $											$ 151,200	$ 264,000
Ms. Christine L. Koski [Member] \| 2012 Equity Incentive Plan [Member] \| Restricted Stock [Member]
Class of Stock [Line Items]
Restricted shares vested for each non-employee director											20,000
Dr. Alan Joslyn [Member]
Class of Stock [Line Items]
Stock option awards					300,000
Exercise price of plan \| $ / shares					$ 0.55
Number of shares vesting in each installment					50,000
Number of vest installments \| Installments					6
Description of award terms											The Company issued (i) stock options to purchase 300,000 shares of the Company's common stock at an exercise price equal to $0.55 per share which stock options shall vest in six installments of 50,000 shares every six months after June 6, 2016, provided that he has continued his employment with the Company through such dates, and (ii) 30,000 shares of restricted stock of the Company, vesting in two installments on the six month and twelve month anniversaries of June 6, 2016.
Dr. Alan Joslyn [Member] \| Restricted Stock [Member]
Class of Stock [Line Items]
Restricted shares awarded to each non-employee director					30,000
Number of vest installments \| Installments					2
Griffin Securities Inc. [Member]
Class of Stock [Line Items]
Warrants, exercised on a net issuance basis								185,585
Shares of common stock issued upon exercise of warrants								98,592
Private Placement [Member]
Class of Stock [Line Items]
Issuance date				Jun. 30, 2016
Shares issued				9,045,679
Number of accredited investors \| Investor				3
Shares issued price per share \| $ / shares				$ 0.5159
Proceeds from issuance \| $				$ 4,667,000
Private Placement [Member] \| KFLP [Member]
Class of Stock [Line Items]
Shares issued				5,815,080
Interest rate				3.00%										6.00%	3.00%
Note receivable due from sale of common stock \| $				$ 2,000,000
Cash received from related parties \| $		$ 1,000,000	$ 1,000,000
Extended maturity date of notes payable											Dec. 31, 2016
Subsequent Event [Member] \| Amendment [Member]
Class of Stock [Line Items]
Number of authorized shares of all classes of our capital stock													270,000,000
Number of authorized shares of common stock													250,000,000