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Warrant Liability - Narrative (Details) - USD ($)				4 Months Ended	12 Months Ended
	May 15, 2017	Feb. 14, 2017	Feb. 09, 2017	May 02, 2016	Dec. 31, 2017	Dec. 31, 2016	May 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued for cash, IPO			3,710,000
Shares issued, price per share (in dollars per share)					$ 1.35	$ 3.00
Warrants, exercise price (in dollars per share)							$ 7.50
Additional shares available for purchase					835,000	460,000
Class of warrants aggregate amounts (in shares)							107,802
Proceeds from issuance, IPO					$ 6,071,000	$ 9,170,000
Series C warrants vested (in shares)				234,297
Change in fair value of warrant liability	$ 1,240,000				$ 2,548,000	$ 0
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, price per share (in dollars per share)			$ 1.35
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued, price per share (in dollars per share)			$ 1.50
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock issued for cash, IPO						1,540,026
Common stock offered for each warrant (in shares)			1
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants granted		8,235,923			8,235,923
Number of shares under warrant, exercised					2,728,434
Series A Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant term			5 years
Class of warrants aggregate amounts (in shares)			278,250
Number of shares under warrant, exercised					1,833,984
Series A Warrant | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock offered for each warrant (in shares)			0.50
Series B Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant term			90 days
Warrants, exercise price (in dollars per share)			$ 1.35
Class of warrants aggregate amounts (in shares)			556,500
Number of shares under warrant, exercised					596,300
Expired Series B and Series C warrants (in shares)	5,087,717
Series B Warrant | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock offered for each warrant (in shares)			1
Series C Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant term			5 years
Class of warrants aggregate amounts (in shares)			278,250
Number of shares under warrant, exercised					298,150
Series C warrants vested (in shares)					298,150
Series C Warrant | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock offered for each warrant (in shares)			0.50
Series A and Series C Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants, exercise price (in dollars per share)			$ 1.50
Underwriting Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants, exercise price (in dollars per share)			$ 0.001
Additional shares available for purchase			556,500
Price per share of common stock issued (in dollars per share)			$ 1.349
Warrants exercised			$ 278,100
Proceeds from issuance, IPO			$ 4,500,000

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Exercise price per share or per unit of warrants or rights outstanding.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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