Fair Value Measurements - Estimated Fair Value of Warrant Liability (Details)		3 Months Ended		4 Months Ended	12 Months Ended
	Jun. 26, 2019 USD ($) item	Jun. 30, 2019 USD ($) NotesSeries	Jun. 26, 2019 USD ($) NotesSeries	Jun. 30, 2019 USD ($) item	Dec. 31, 2019 USD ($) item shares	Oct. 31, 2019 USD ($)	Sep. 30, 2019 $ / shares	Jul. 31, 2019 USD ($) Y $ / shares	Jul. 23, 2019 USD ($) $ / shares	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Oct. 31, 2018 USD ($) Y $ / shares
Fair Value Assumptions and Methodology for Assets and Liabilities
Principal amount						$ 550,000
Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Derivative asset						$ 136,484
Stock price | Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Derivative asset						1.04
Strike price | Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Derivative asset						1.04
Expected life | Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Derivative asset						1
Volatility | Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Derivative asset						144.27
Risk free rate | Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Derivative asset						1.75
Series A Warrants | Stock price
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.0065						0.1610
Series A Warrants | Strike price
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					7.8750						7.8750
Series A Warrants | Expected life
Fair Value Assumptions and Methodology for Assets and Liabilities
Weighted-average expected term (years)					2 years 4 months 28 days						3 years 4 months 28 days
Series A Warrants | Volatility
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					1.4341						1.3563
Series A Warrants | Risk free rate
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.0162						0.0246
Series 1 warrants
Fair Value Assumptions and Methodology for Assets and Liabilities
Weighted-average expected term (years)								5 years
Exercise price (in dollars per share) | $ / shares							$ 1.40	$ 2.00
Warrant Exercise During Period, Shares | shares					1,250,000
Proceeds from Issuance of Warrants					$ 1,750,001
Series 1 warrants | Stock price
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability								1.73
Series 1 warrants | Strike price
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability								2.00
Series 1 warrants | Expected life
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability | Y								5.0
Series 1 warrants | Volatility
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability								0.10925
Series 1 warrants | Risk free rate
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability								1.83
Series B-1 convertible preferred stock
Fair Value Assumptions and Methodology for Assets and Liabilities
Stock Issued During Period, Shares, New Issues | shares					63
Underwriter Warrants
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant												$ 611,286
Exercise price (in dollars per share) | $ / shares												$ 52.50
Underwriter Warrants | Stock price
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.0065						0.1610	41.30
Underwriter Warrants | Strike price
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.5250						0.5250	52.50
Underwriter Warrants | Expected life
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability | Y												5
Weighted-average expected term (years)					3 years 9 months 4 days						4 years 9 months 4 days
Underwriter Warrants | Volatility
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					1.4341						1.3563	0.138
Underwriter Warrants | Risk free rate
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.0169						0.0251	2.51
LOC Warrants
Fair Value Assumptions and Methodology for Assets and Liabilities
Change in fair value of liability					$ 45,218
LOC Warrants | Stock price
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.0173					0.1960
LOC Warrants | Strike price
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.0200					0.1750
LOC Warrants | Expected life
Fair Value Assumptions and Methodology for Assets and Liabilities
Weighted-average expected term (years)					5 years					5 years
LOC Warrants | Volatility
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					1.4743					1.4572
LOC Warrants | Risk free rate
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.0183					0.0223
2019 Bridge Note Warrants
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant		$ 4,259,327		$ 4,259,327				$ 5,005,742	$ 4,259,327
Change in fair value of liability					$ 746,415
Principal amount	$ 5,050,000		$ 5,050,000
Number of promissory notes issued | item	21
Number of warrants issued				21
Term of promissory notes				4 months
2019 Bridge Note Warrants | Stock price
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.0173
2019 Bridge Note Warrants | Stock price | Minimum
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability								0.0484
2019 Bridge Note Warrants | Stock price | Maximum
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability								0.3290
2019 Bridge Note Warrants | Strike price
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.0200
2019 Bridge Note Warrants | Expected life
Fair Value Assumptions and Methodology for Assets and Liabilities
Weighted-average expected term (years)					4 years 9 months 18 days			5 years
2019 Bridge Note Warrants | Volatility
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					1.4584
2019 Bridge Note Warrants | Volatility | Minimum
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability								1.4560
2019 Bridge Note Warrants | Volatility | Maximum
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability								1.4572
2019 Bridge Note Warrants | Risk free rate
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability					0.0176
2019 Bridge Note Warrants | Risk free rate | Minimum
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability								0.0176
2019 Bridge Note Warrants | Risk free rate | Maximum
Fair Value Assumptions and Methodology for Assets and Liabilities
Warrant liability								0.0223
Warrant liability | Recurring | Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant					$ 3,492						$ 220,376
Change in fair value of liability					(1,009,402)
Warrant liability | Series A Warrants
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant					10						7,388
Change in fair value of liability					7,378
Warrant liability | Series A Warrants | Recurring | Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant					10						7,388
Warrant liability | Underwriter Warrants
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant					3,482						212,988
Warrant liability | Underwriter Warrants | Recurring | Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant					3,482						$ 212,988
Change in fair value of liability					209,506
Warrant liability | LOC Warrants
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant										$ 116,297
Warrant liability | LOC Warrants | Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant					71,079
Warrant liability | LOC Warrants | Recurring | Level 3
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant					0
Warrant liability | 2019 Bridge Note Warrants | Recurring
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant					$ 0
2019 Bridge Notes
Fair Value Assumptions and Methodology for Assets and Liabilities
Fair value of warrant		5,005,742		$ 5,005,742
Principal amount		$ 5,050,000		$ 5,050,000
Number of promissory notes issued		21	21	21
Fourteen Promissory Notes [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities
Principal amount		$ 3,550,000		$ 3,550,000
Number of promissory notes issued		14		14
Warrant coverage percentage		125.00%		125.00%
Seven Promissory Notes [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities
Principal amount		$ 1,500,000		$ 1,500,000
Number of promissory notes issued		7		7
Warrant coverage percentage		75.00%		75.00%
Twenty One Promissory Notes [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities
Number of promissory notes issued | item				21
Twenty One Promissory Notes [Member] | 2019 Bridge Note Warrants
Fair Value Assumptions and Methodology for Assets and Liabilities
Exercise price (in dollars per share) | $ / shares									$ 2.00