Common Stock - Additional Information (Detail) - Registered Direct Offering [Member]	Mar. 12, 2019 USD ($) Investor $ / shares shares	Jun. 30, 2019 USD ($)
Changes In Equity And Comprehensive Income Line Items [Line Items]
Sale of transaction date	Mar. 12, 2019
Number of institutional investors involved in offering | Investor	2
Common units outstanding | shares	1,500,000
Warrant expiration period	5 years
Net proceeds from offering | $	$ 12,668,784
Deemed dividend | $		$ 452,925
Maximum [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]
Per share exercise price	$ 4.1798
Minimum [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]
Per share exercise price	2.7568
Common Units
Changes In Equity And Comprehensive Income Line Items [Line Items]
Public offering price per share	$ 3.21
Shares of common stock called by warrants | shares	0.70
Per share exercise price	$ 3.21
Pre-funded Units [Member]
Changes In Equity And Comprehensive Income Line Items [Line Items]
Common units outstanding | shares	2,861,370
Public offering price per share	$ 3.20
Shares of common stock called by warrants | shares	0.70
Per share exercise price	$ 3.21
Per share exercise price	$ 0.01