Equity Transactions - Underwritten Public Offering - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended
	Oct. 01, 2020	Sep. 15, 2020	Mar. 05, 2020	Mar. 31, 2021	Mar. 31, 2020
Class Of Stock [Line Items]
Proceeds from equity offering				$ 4,253
Series D Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock, conversion basis				The shares of Series D Preferred Stock are convertible on a one-to-one basis into shares of common stock at any time at the option of the holder, provided that the holder will be prohibited from converting the Series D Preferred Stock into shares of common stock if, as a result of such conversion, the holder, together with its affiliates, would own more than 9.99% of the total number of shares of common stock then issued and outstanding, subject to certain exceptions.
Maximum percentage of common stock holding upon conversion of preferred stock		9.99%
Preferred stock, liquidation per share		$ 0.001
Voting rights				no
Common Stock [Member]
Class Of Stock [Line Items]
Issuance of stock, shares			1,046,249	257,185	1,046,249
Proceeds from equity offering	$ 11,200
Underwritten Public Offering [Member]
Class Of Stock [Line Items]
Underwritten offering, exercisable term		30 days
Gross proceeds from issuance of common and preferred stock		$ 80,000
Net proceeds from issuance of common and preferred stock		$ 74,700
Underwritten Public Offering [Member] | Series D Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Issuance of stock, shares		3,215,000
Share price		$ 10.00
Underwritten Public Offering [Member] | Common Stock [Member]
Class Of Stock [Line Items]
Issuance of stock, shares	1,200,000	4,785,000
Share price	$ 10.00	$ 10.00
Underwritten Public Offering [Member] | Maximum [Member]
Class Of Stock [Line Items]
Additional number of common stock issuable		1,200,000