Warrants - Additional Information (Detail) - $ / shares			1 Months Ended		12 Months Ended
	Oct. 10, 2018	Oct. 02, 2018	Aug. 31, 2017	May 31, 2017	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Class Of Warrant Or Right [Line Items]
Replacement warrants issued in connection with the Mergers				155
Exchanges (see Note 10)			78,181		1,000,000
Warrants outstanding					2,776,191	1,777,611		10,384,706
Common stock, shares issued					40,993,768	37,142,946
Number of Common Stock Warrants					2,776,191	1,777,611		10,384,706
2018 Unit Offering [Member]
Class Of Warrant Or Right [Line Items]
Common units outstanding		2,400,000
Exercise price of warrants or rights		$ 6.00
Issuance of transaction date		Oct. 02, 2018
2018 Unit Offering [Member] | Common Units [Member]
Class Of Warrant Or Right [Line Items]
Public offering price per share		$ 5.00
Exercise price of warrants or rights		$ 6.00
Warrant expiration period		5 years
2018 Unit Offering [Member] | Prefunded Units [Member]
Class Of Warrant Or Right [Line Items]
Public offering price per share		$ 4.99
Exercise price of warrants or rights		$ 0.01
Two Thousand Eighteen Registered Direct Offering
Class Of Warrant Or Right [Line Items]
Common units outstanding	4,629,630
Exercise price of warrants or rights	$ 5.40
Issuance of transaction date	Oct. 10, 2018
Two Thousand Eighteen Registered Direct Offering | Common Units [Member]
Class Of Warrant Or Right [Line Items]
Public offering price per share	$ 5.40
Exercise price of warrants or rights	$ 5.40
Warrant expiration period	5 years
Two Thousand Eighteen Registered Direct Offering | Prefunded Units [Member]
Class Of Warrant Or Right [Line Items]
Public offering price per share	$ 5.39
Exercise price of warrants or rights	0.01
Redeemable Preferred Stock Warrants [Member]
Class Of Warrant Or Right [Line Items]
Conversion of warrants into common stock and cash						1,550
Warrants outstanding						62
Common stock, shares issued							62
Number of Common Stock Warrants						62
Redeemable Preferred Stock Warrants [Member] | Market Offering [Member]
Class Of Warrant Or Right [Line Items]
Warrants outstanding							1,420
Number of Common Stock Warrants							1,420
Underwriter Warrant Issued In 2018 Unit Offering [Member]
Class Of Warrant Or Right [Line Items]
Warrants outstanding		196,650
Number of Common Stock Warrants		196,650
Public offering price per share		125.00%
Issued With Common Units In 2018 Registered Direct Offering [Member]
Class Of Warrant Or Right [Line Items]
Warrants outstanding					92,300	92,300
Exercise price of warrants or rights					$ 5.40	$ 5.40
Number of Common Stock Warrants					92,300	92,300
Issued With Common Units In 2018 Registered Direct Offering [Member] | Minimum [Member]
Class Of Warrant Or Right [Line Items]
Exercise price of warrants or rights	6.00
Issued With Common Units In 2018 Registered Direct Offering [Member] | Maximum [Member]
Class Of Warrant Or Right [Line Items]
Exercise price of warrants or rights	$ 4.1798