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Stockholders' Equity - Additional information (Details) - USD ($)		3 Months Ended		9 Months Ended
	Nov. 13, 2015	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Oct. 13, 2017	Mar. 31, 2017	Jun. 30, 2016	Apr. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		20,000	0	20,000	0
Stock Issued During Period, Shares, New Issues			69,768		69,768
Proceeds from Issuance of Common Stock, Gross					$ 98,000
Proceeds from Issuance of Common Stock			$ 91,000	$ 6,948,122	$ 90,761
Class of Warrant or Right, Redemption Price of Warrants or Rights	$ 63.96			$ 0.001
Controlled Equity Offering Sales Agreement Maximum Amount Authorized							$ 20,000,000
Share Issued, Price Per Share			1.40%		1.40%
Stock Issued During Period, Value, New Issues		$ 603,677	$ 90,761	$ 6,948,122	$ 90,761
Common Stock Preferred Stock Debt Securities Warrants And Units To Be Sold Amount Maximum						$ 150,000,000
Common Stock Additional Amount Authorized						$ 25,000,000
Equity Method Investment, Ownership Percentage	15.00%
Allocated Share-based Compensation Expense		58,113	$ 243,536	$ 781,390	$ 1,124,970
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 7 months 10 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 653,000		$ 653,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period				20,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		24,000		79,000	80,000
Accredited Investors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues		283,782		3,276,286
Proceeds from Issuance of Common Stock		$ 604,000		$ 6,900,000
Share Issued, Price Per Share		2.22%		2.19%
Stock Issued During Period, Value, New Issues		$ 629,000		$ 7,200,000
At The Market Offering [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues				6,261,342
Proceeds from Issuance of Common Stock				$ 18,200,000
Share Issued, Price Per Share				3.02%
Stock Issued During Period, Value, New Issues				$ 18,900,000
Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		3,221,906		3,221,906
2014 Equity Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized									1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		892,383		892,383
Contractual Life				10 years
2011 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant									271,906
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross				50,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 587,000		$ 587,000
Maximum [Member] \| 2014 Equity Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		3,221,906		3,221,906				2,471,906
Minimum [Member] \| 2014 Equity Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		2,471,906		2,471,906				1,271,906