Stock Sales (Detail)					3 Months Ended	9 Months Ended
	Aug. 16, 2017 USD ($) $ / shares shares	Jan. 24, 2017 shares	Jan. 23, 2017 USD ($) $ / shares shares	Aug. 16, 2016 item	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 $ / shares shares
Class of Stock [Line Items]
Gross proceeds before deducting estimate offering expenses | $			$ 19,000,000
Offering costs | $			$ 2,500,000
Number of common stock					12,208,671	12,208,671	2,736,621
Common stock upon the exercise of outstanding warrants	2,575,000				599,670	599,670
Beneficial ownership percentage			4.99%
Common stock (in shares)			1,218,107		12,208,671	12,208,671	2,736,621
Common stock, par value | $ / shares					$ 0.01	$ 0.01	$ 0.01
Conversion of convertible preferred shares to common stock					21,528,000	21,528,000
Warrants expense | $	$ 4,400,000				$ 4,438,149	$ 4,438,149
Estimated assumptions
Risk-free interest rates	2.03%
Expected life	7 years
Expected dividends	0.00%
Expected volatility	112.03%
Class A Units
Class of Stock [Line Items]
Offer price | $ / shares			$ 5.31
Number of common stock			1
Common stock upon the exercise of outstanding warrants			1
Warrant Term			5 years
Exercise price | $ / shares			$ 5.84
Shares issued upon conversion (in shares)			188
Class B Units
Class of Stock [Line Items]
Offer price | $ / shares			$ 1,000
Common stock upon the exercise of outstanding warrants			3,577,994
Shares issued upon conversion (in shares)			2,359,894
Preferred Stock.
Class of Stock [Line Items]
Shares issued upon conversion (in shares)		2,359,894	2,359,894
Preferred stock ( in shares)			12,531
Series B convertible preferred stock
Class of Stock [Line Items]
Preferred stock ( in shares)					11,003	11,003	0
Number of common stock					20,000	20,000
Preferred stock, par value | $ / shares					$ 0.01	$ 0.01	$ 0.01
Warrants 2017
Class of Stock [Line Items]
Common stock upon the exercise of outstanding warrants			188
Over-allotment option
Class of Stock [Line Items]
Common stock shares issued (in shares)			466,695
Net proceeds | $	$ 18,000,000
Over-allotment option | Series B convertible preferred stock
Class of Stock [Line Items]
Shares issued upon conversion (in shares)	435					3,913,695
Preferred stock ( in shares)					8,997	8,997
Common stock shares issued (in shares)	20,000
Number of common stock	1
Preferred stock, par value | $ / shares	$ 0.01
Common stock, par value | $ / shares	0.01
Conversion Price Per Share | $ / shares	2.30
Number of embedded features | item				2
Over-allotment option | Warrants to purchase common stock
Class of Stock [Line Items]
Offer price | $ / shares	$ 1,000
Common stock upon the exercise of outstanding warrants	1
Warrant Term	7 years
Exercise price | $ / shares	$ 2.30
Conversion of convertible preferred shares to common stock	435
Over-allotment option | Warrants 2017
Class of Stock [Line Items]
Common stock shares issued (in shares)			466,695