Description of Business and Summary of Significant Accounting Policies - Schedule of Computation of Diluted Net Loss per Share of Common Stock Attributable to Common Stockholders (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Amount of potentially dilutive shares excluded from computation of diluted net loss per share of common stock	34,531,597	42,998,593	31,877,254	42,998,593
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Amount of potentially dilutive shares excluded from computation of diluted net loss per share of common stock	9,459,249	9,354,250	9,459,249	9,354,250
Warrants [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Amount of potentially dilutive shares excluded from computation of diluted net loss per share of common stock	12,606,255	20,031,255	12,606,255	20,031,255
Secured Convertible Promissory Notes [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Amount of potentially dilutive shares excluded from computation of diluted net loss per share of common stock	205,705	1,674,699		1,674,699
Redeemable Series A Preferred Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Amount of potentially dilutive shares excluded from computation of diluted net loss per share of common stock	138,597	126,597		126,597
Redeemable Series B Preferred Stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Amount of potentially dilutive shares excluded from computation of diluted net loss per share of common stock	2,310,041	2,105,041		2,105,041
Four Convertible Promissory Notes [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Amount of potentially dilutive shares excluded from computation of diluted net loss per share of common stock	7,463,750	7,358,750	7,463,750	7,358,750
Purchase of Fixed Assets [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Amount of potentially dilutive shares excluded from computation of diluted net loss per share of common stock	2,348,000	2,348,000	2,348,000	2,348,000