Stockholders' Equity - Capital Structure (Details)				1 Months Ended						3 Months Ended	12 Months Ended
	Dec. 05, 2019 shares	Oct. 01, 2018 USD ($)	Sep. 27, 2018 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Aug. 31, 2019 shares	May 31, 2019 USD ($)	Jan. 31, 2019 USD ($) shares	Dec. 31, 2017 USD ($) $ / shares shares	Oct. 31, 2017 USD ($)	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) Vote / shares $ / shares shares	Dec. 04, 2017 USD ($) $ / shares
Subsidiary, Sale of Stock [Line Items]
Shares issued | shares	207,400,000						3,164,015	1,783,587		89,390	942,285
Share Price | $ / shares			$ 3.00					$ 5.325
Proceeds from issuance of common stock, gross			$ 8,900,000					$ 9,500,000
Proceeds from issuance of common stock, net		$ 8,800,000						8,800,000
Common stock sales agreement, authorized amount			$ 2,966,667	$ 80,000,000		$ 50,000,000			$ 30,000,000
Common stock sales agreement, gross sales							$ 25,800,000			$ 7,300,000	$ 20,100,000
Common stock sales agreement, net sales										$ 7,100,000	$ 19,500,000
Common stock sales agreement, commission percentage				3.00%		3.00%	3.00%			3.00%	3.00%
Issuance costs								$ 745,856
Exercise price | $ / shares								$ 5.25
Warrant utilized								$ 9,400,000
Common stock, voting right per share | Vote / shares											1
Underwritten Public Offering
Subsidiary, Sale of Stock [Line Items]
Shares issued | shares				2,300,000
Share Price | $ / shares				$ 87.00						$ 87.00	$ 87.00
Proceeds from issuance of common stock, gross				$ 200,100,000
Proceeds from issuance of common stock, net				$ 187,100,000
Common warrants
Subsidiary, Sale of Stock [Line Items]
Shares issued | shares					6,969
Share Price | $ / shares								$ 5.60				$ 5.00
Issuance costs								$ 583,768
Fair Value Of Warrants								$ 2,683,000				$ 2,064,000
Placement agent warrants
Subsidiary, Sale of Stock [Line Items]
Shares issued | shares								107,015
Share Price | $ / shares								$ 5.60				$ 5.00
Issuance costs								$ 81,000
Exercise price | $ / shares								$ 6.6562
Warrant utilized								$ 712,313
Fair Value Of Warrants								$ 108,000				$ 81,000