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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Equity and Share-Based Compensation - Additional Information (Detail)	1 Months Ended		9 Months Ended
	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 Title shares	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense \| $			$ 1,864,000	$ 1,597,000
Options exercised during period			32,200	0
Proceeds from stock options exercised \| $			$ 181,000
Original Content Acquisition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of titles of original content acquired to be integrated \| Title		450
Class A Common Stock [Member] \| Complementary Streaming Platform [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock as consideration for acquisition		404,891
Shares issued for consideration of earnout payments	139,617
Share-based compensation expense \| $	$ 715,000
Class A Common Stock [Member] \| Original Content Acquisition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock as consideration for acquisition		79,941