Significant Accounting Policies - Additional Information (Detail)		3 Months Ended		12 Months Ended
	Mar. 05, 2020 USD ($) ft² $ / ft²	Mar. 31, 2020 USD ($) Segment $ / shares shares	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2020	Dec. 31, 2019 shares	Jul. 16, 2018 $ / shares	Dec. 26, 2017 $ / shares	May 31, 2016 shares
Significant Accounting Policies [Line Items]
License payment term for product goods and service		1 year
Payment by licensees and transfer of promised goods or services to licensees will be one year or less		true
Short-term operating lease expense		$ 200,000	$ 200,000
Sub lease area | ft²	10,158
Sublease income, per square foot | $ / ft²	47.00
Sublease income, per year in base rent	$ 500,000
Increase in annual rent, percentage	3.00%
Subleases security deposit	$ 300,000
Subleases expiration date	Nov. 30, 2022
Sublease term	2 years 8 months 12 days
Operating lease right-of-use asset	$ 1,200,000	1,225,000
Operating lease liability	$ 1,000,000	$ 1,030,000
Lease incremental borrowing rate	7.58%
Payments to acquire furniture	$ 100,000
Common stock, shares issued | shares		16,080,616			16,081,000
Non-cash change in fair value of PIPE Warrant liability		$ (2,648,000)	(8,815,000)
Restricted cash balances		0
Transfers of financial assets from Level 1 to Level 2		0
Transfers of financial assets from Level 2 to Level 1		0
Tax benefits of the stock based compensation expenses recognized		$ 0	0
United States
Significant Accounting Policies [Line Items]
Number of operating segments | Segment		1
Non-US
Significant Accounting Policies [Line Items]
Net assets located outside of the United States		$ 0
Scenario Forecast
Significant Accounting Policies [Line Items]
Effective tax rate				0.00%
PIPE Warrants
Significant Accounting Policies [Line Items]
Warrants exercise price | $ / shares		$ 10.00
Minimum
Significant Accounting Policies [Line Items]
Marketable securities maturity term		3 months
Maximum
Significant Accounting Policies [Line Items]
Marketable securities maturity term		24 months
PIPE Warrants
Significant Accounting Policies [Line Items]
Warrant liability		$ 9,300,000
Non-cash change in fair value of PIPE Warrant liability		2,600,000	8,800,000
Reduction in warrant liability in connection with warrant exercises		$ 0	$ 0
PIPE Warrants | Private Placement
Significant Accounting Policies [Line Items]
Common stock, shares issued | shares								1,764,242
Warrants exercisable shares of common stock exercised | shares		80,309
Cash proceeds		$ 800,000
Warrants exercisable shares of common stock outstanding | shares		1,683,933
Offering Warrants
Significant Accounting Policies [Line Items]
Warrants exercise price | $ / shares		$ 12.50
Settlement Warrants
Significant Accounting Policies [Line Items]
Warrants exercise price | $ / shares			$ 30.00			$ 30.00	$ 3.00