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Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Thousands				3 Months Ended
	Jul. 16, 2020 shares	Apr. 10, 2020 USD ($) $ / shares shares	Sep. 30, 2016 $ / shares shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($)	Dec. 31, 2020 $ / shares shares	Jul. 17, 2020 shares
Schedule Of Capitalization Equity [Line Items]
Common stock, par value (in dollars per share) \| $ / shares				$ 0.001		$ 0.001
Common stock, shares authorized (in shares) \| shares	250,000,000			100,000,000		100,000,000	100,000,000
Common stock, shares issued (in shares) \| shares				20,625,637		19,663,698
Common stock, shares outstanding (in shares) \| shares				20,625,637		19,663,698
Common stock, reverse stock split				1-for-10
Common stock, reverse stock split ratio	0.1
Proceeds from common stock issued \| $				$ 0	$ 214
Derivative liability fair value adjustment \| $				(90)	700
Warrant liabilities fair value adjustment \| $				1,296	4,768
Warrant liabilities \| $				49,900	51,200
Warrants to purchase common stock associated with Loan Agreement
Schedule Of Capitalization Equity [Line Items]
Number of warrants issued to purchase common stock (in shares) \| shares			12,243
Exercise price of warrants (in dollars per share) \| $ / shares			$ 36.754
Warrant expiration period			5 years
Senior Convertible Note Purchase Agreement \| Other (Income) Expense
Schedule Of Capitalization Equity [Line Items]
Derivative liability fair value adjustment \| $				$ (100)	$ 700
Aspire Capital \| Common Stock Purchase Agreement
Schedule Of Capitalization Equity [Line Items]
Number of purchase aggregate shares of common stock \| shares		1,956,547
Percentage of common stock outstanding		19.99%
Number of shares committed \| shares		70,910
Average purchase price of shares sold \| $ / shares		$ 8.461
Percentage of common stock owned		19.99%
Aspire Capital \| Common Stock Purchase Agreement \| Maximum
Schedule Of Capitalization Equity [Line Items]
Sale of common stock at sole discretion \| $		$ 20,000