Investments - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Unrealized gains (loss) on equity Investments	$ 300,000	$ (1,534,000)
Impairments or adjustments equity investments under measurement alternative	0	0
Investment in joint venture under the equity method	8,100,000		$ 9,300,000
Fluent [Member]
Schedule Of Available For Sale Securities [Line Items]
Investment in joint venture under the equity method	4,039,000		5,291,000
Fluent [Member] | Joint Venture [Member]
Schedule Of Available For Sale Securities [Line Items]
Investment in joint venture under the equity method	493,000	0
Total fees charged	372,000	1,880,000
Fluent [Member] | Joint Venture [Member] | Accounts Payable [Member]
Schedule Of Available For Sale Securities [Line Items]
Total fees charged	1,785,000		674,000
Cannfections [Member]
Schedule Of Available For Sale Securities [Line Items]
Investment in joint venture under the equity method	4,061,000		$ 4,009,000
Cannfections [Member] | Joint Venture [Member]
Schedule Of Available For Sale Securities [Line Items]
Investment in joint venture under the equity method	0	0
Expenses for purchases	448,000	$ 80,000
Convertible Debt Instrument [Member]
Schedule Of Available For Sale Securities [Line Items]
Convertible debt instruments cash settlement amount	$ 2,500,000