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Stockholders' Equity (Narrative) (Details) - USD ($)										1 Months Ended		12 Months Ended
	Feb. 08, 2021	Dec. 14, 2020	Aug. 17, 2020	Aug. 07, 2020	May 06, 2020	Apr. 17, 2019	Apr. 05, 2019	Mar. 21, 2019	Oct. 24, 2018	Jun. 30, 2019	Jan. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 28, 2020	Apr. 30, 2019	Apr. 26, 2016
Stockholders' Equity
Authorized shares of common and preferred stock												85,000,000
Authorized shares of preferred stock												5,000,000
Authorized shares of common stock												80,000,000	80,000,000
Issued shares of preferred stock												0	0
Outstanding shares of preferred stock												0	0
Issued shares of common stock												55,497,133	21,635,365
Outstanding shares of common stock												55,497,133	21,635,365
Common stock, voting rights, number of votes per share												one
Value of equity subscription												$ 104,625,615	$ 12,395,348	$ 10,616,046
Common stock issued (in dollars per share)												$ 0.001	$ 0.001
Share-based Compensation
Share-based compensation expense												$ 436,691	$ 872,177	263,396
Share-based compensation												436,691	872,177	263,396
Restricted Stock [Member]
Share-based Compensation
Share-based compensation expense												186,000	385,000	27,000
Unearned share-based compensation expense in future periods												$ 95,000
Unearned share-based compensation earn period												2 years 2 months 12 days
Employee Stock Option [Member]
Share-based Compensation
Share-based compensation expense												$ 251,000	$ 487,000	$ 236,000
Unearned share-based compensation expense in future periods												$ 84,000
Unearned share-based compensation earn period												2 years 6 months
Exercisable term												10 years
Stock option grants (in dollars per share)												$ 1.49	$ 1.62	$ 2.50
Exercised (in shares)												0	0	0
Intrinsic value of options exercised												$ 0	$ 0	$ 0
Intrinsic value of options outstanding												3,600,000	1,000	0
Intrinsic value of exercisable options												$ 3,200,000	$ 1,000	$ 0
Expected volatility														81.00%
Risk free interest rate														2.60%
Expected dividend yield												0.00%	0.00%	0.00%
Expected life (in years)												5 years	5 years	5 years
Minimum [Member] | Employee Stock Option [Member]
Share-based Compensation
Award vesting period												1 year
Expected volatility												101.00%	89.00%
Risk free interest rate												0.31%	1.55%
Maximum [Member] | Employee Stock Option [Member]
Share-based Compensation
Award vesting period												3 years
Expected volatility												104.00%	100.00%
Risk free interest rate												1.67%	2.85%
2016 Equity Incentive Plan, Original Grants [Member] | Restricted Stock [Member]
Share-based Compensation
Shares available for grant																	450,000
2016 Equity Incentive Plan, Additional Grants [Member] | Restricted Stock [Member]
Share-based Compensation
Shares available for grant															1,000,000	450,000
2016 Equity Incentive Plan [Member] | Restricted Stock [Member]
Share-based Compensation
Shares available for grant															1,900,000	900,000
2016 Equity Incentive Plan [Member] | Employee Stock Option [Member]
Share-based Compensation
Shares available for grant												996,767	198,034	268,138
Warrant [Member]
Stockholders' Equity
Shares issued in connection with the exercise of warrants												713,449
Proceeds from issuance or sale of equity													$ 300,000	$ 800,000
Warrants [Abstract]
Exercise price (in dollars per share)												$ 3.25	$ 3.25
Warrant [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)												713,449
Proceeds from issuance or sale of equity												$ 2,300,000
Accelerated Share-Based Compensation Summary [Member]
Share-based Compensation
Share-based compensation										$ 134,000
Number of options for the Company's former CEO										153,940
Accelerated Share-Based Compensation Summary [Member] | Former Chief Executive Officer [Member]
Share-based Compensation
Expected volatility										97.00%
Expected dividend yield										0.00%
Accelerated Share-Based Compensation Summary [Member] | Former Chief Executive Officer [Member] | Minimum [Member]
Share-based Compensation
Risk free interest rate										1.71%
Expected life (in years)										1 year 6 months
Accelerated Share-Based Compensation Summary [Member] | Former Chief Executive Officer [Member] | Maximum [Member]
Share-based Compensation
Risk free interest rate										1.92%
Expected life (in years)										5 years
Accelerated Share-Based Compensation Summary [Member] | Chief Executive Officer [Member]
Share-based Compensation
Number of options for the Company's former CEO										153,940
Common Stock [Member]
Stockholders' Equity
Value of equity subscription												$ 33,028	$ 6,246	$ 3,692
Issued (in shares)												33,028,000	6,246,360	3,692,307
Shares issued in conjunction with the exercise of warrants														249,824
Shares issued in connection with the exercise of warrants												713,449	83,564	2,500,285
January 2018 Public Offering [Member]
Stockholders' Equity
Proceeds from issuance or sale of equity											$ 10,600,000
January 2018 Public Offering [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)											3,692,307
January 2018 Public Offering [Member] | Warrant [Member]
Stockholders' Equity
Issued (in shares)											4,246,153
January 2018 Public Offering [Member] | Majority Shareholder [Member]
Stockholders' Equity
Proceeds from issuance or sale of equity											$ 5,000,000.0
January 2018 Public Offering [Member] | Majority Shareholder [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)											1,538,461
January 2018 Public Offering [Member] | Majority Shareholder [Member] | Warrant [Member]
Stockholders' Equity
Issued (in shares)											1,538,461
October 2018 Common Share Offering [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)									2,250,461
Proceeds from issuance or sale of equity									$ 4,300,000
Common stock issued (in dollars per share)									$ 2.00
October 2018 Common Share Offering [Member] | Majority Shareholder [Member] | Warrant [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)									1,538,461
Proceeds from issuance or sale of equity									$ 3,100,000
March 2019 Public Offering [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)								3,345,282
Proceeds from issuance or sale of equity								$ 6,600,000
April 2019 Public Offering [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)							2,554,590
Proceeds from issuance or sale of equity							$ 5,100,000
April 17, 2019 Public Offering [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)						346,488
Proceeds from issuance or sale of equity						$ 700,000
May 2020 Common Shares Issuance [Member] | Common Stock [Member]
Stockholders' Equity
Value of equity subscription					$ 41,000
Issued (in shares)					20,000
August 2020 Public Offering [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)				11,000,000
Proceeds from issuance or sale of equity				$ 25,800,000
Overallotment Exercise [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)			1,650,000
Proceeds from issuance or sale of equity			$ 3,900,000
December 2020 Public Offering [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)		10,028,000
Proceeds from issuance or sale of equity		$ 60,400,000
Subsequent Event [Member] | February 2021 Public Offering [Member] | Common Stock [Member]
Stockholders' Equity
Issued (in shares)	14,950,000
Proceeds from issuance or sale of equity	$ 119,200,000

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