Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Jul. 18, 2020	Jan. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts			$ 7,232	$ 4,786
Retail advertising expenses			61,036	72,518	$ 68,756
Increase (decrease) in retained earnings			50,521	529,721	1,043,621		$ 968,790
Increased Additional Paid In Capital		$ 662
Increased Deferred Income Tax Asset		159
Retained (deficit) earnings			(565,457)	(37,219)
Retained Earnings (Deficit) [Member]
Significant Accounting Policies [Line Items]
Increase (decrease) in retained earnings			$ (565,457)	$ (37,219)	495,777		372,596
Cumulative Effect of Change in Accounting Principle, Net [Member]
Significant Accounting Policies [Line Items]
Increase (decrease) in retained earnings					159		(78)
Cumulative Effect of Change in Accounting Principle, Net [Member] | Retained Earnings (Deficit) [Member]
Significant Accounting Policies [Line Items]
Increase (decrease) in retained earnings					$ (503)		$ (78)
ASU 2018-13 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]			true
ASU 2018-07 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
ASU 2018-07 [Member] | Cumulative Effect of Change in Accounting Principle, Net [Member] | Retained Earnings (Deficit) [Member]
Significant Accounting Policies [Line Items]
Increase (decrease) in retained earnings		$ (503)
ASU 2017-12 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]			true
Accounting Standards Update 2017-04
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
ASU 2016-18 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]			true
ASU 2016-15 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]			true
ASU 2016-13 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]			true
Change In Accounting Principle Accounting Standards Update Adoption Date			Jan. 01, 2020
ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]			true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]			true
ASU 2014-09 [Member]
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]					true
Change In Accounting Principle Accounting Standards Update Adoption Date					Jan. 01, 2018
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible List]					us-gaap:AccountingStandardsUpdate201409RetrospectiveMember
ASU 2014-09 [Member] | Cumulative Effect of Change in Accounting Principle, Net [Member] | Customer Payments [Member]
Significant Accounting Policies [Line Items]
Retained (deficit) earnings						$ 46
ASU 2014-09 [Member] | Cumulative Effect of Change in Accounting Principle, Net [Member] | Metallic Balloon Sales [Member]
Significant Accounting Policies [Line Items]
Retained (deficit) earnings						8
ASU 2014-09 [Member] | Cumulative Effect of Change in Accounting Principle, Net [Member] | Discount Sale [Member]
Significant Accounting Policies [Line Items]
Retained (deficit) earnings						$ 40
Restricted Stock Units (RSUs) [Member]
Significant Accounting Policies [Line Items]
Antidilutive securities excluded from calculation of earnings per share			787,313	413,968	141,400
Performance Restricted Stock Units [Member]
Significant Accounting Policies [Line Items]
Antidilutive securities excluded from calculation of earnings per share			1,206,723
Employee Stock Option [Member]
Significant Accounting Policies [Line Items]
Antidilutive securities excluded from calculation of earnings per share			3,240,461	3,510,317	2,394,868
Warrant [Member]
Significant Accounting Policies [Line Items]
Antidilutive securities excluded from calculation of earnings per share			1,000,000	596,000	596,000
Performance-based Restricted Stock Units [Member]
Significant Accounting Policies [Line Items]
Share based stock awards vesting period	3 years
Share-based compensation arrangement service vesting period of thresholds	2 years
Vesting Period 1 [Member] | Performance-based Restricted Stock Units [Member]
Significant Accounting Policies [Line Items]
Share-based Compensation weighted average of the fair market value per share of the common Stock	$ 2.50
Vesting Period 2 [Member] | Performance-based Restricted Stock Units [Member]
Significant Accounting Policies [Line Items]
Share-based Compensation weighted average of the fair market value per share of the common Stock	5.00
Vesting Period 3 [Member] | Performance-based Restricted Stock Units [Member]
Significant Accounting Policies [Line Items]
Share-based Compensation weighted average of the fair market value per share of the common Stock	7.50
Share Based Compensation Award Tranche Four | Performance-based Restricted Stock Units [Member]
Significant Accounting Policies [Line Items]
Share-based Compensation weighted average of the fair market value per share of the common Stock	$ 10.00
Retail Segment [Member]
Significant Accounting Policies [Line Items]
Revenue, information used to determine transaction price			The transaction price for the majority of the Company’s retail sales is based on either: 1) the item’s stated price or 2) the stated price adjusted for the impact of a coupon which can only be applied to such transaction. To the extent that the Company charges customers for freight costs on e-commerce sales, the Company records such amounts in revenue. The Company excludes all sales taxes and value-added taxes from revenue.
Retail Segment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Royalty fee percentage			4.00%
Retail Segment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Royalty fee percentage			6.00%
Wholesale Segment [Member]
Significant Accounting Policies [Line Items]
Revenue, information used to allocate transaction price			the determination of the transaction price is fixed based on the contract and/or purchase order.
Wholesale Segment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Receivables collection period			30 days
Wholesale Segment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Receivables collection period			120 days
Convergram Mexico, S. De R.L. De C.V. [Member]
Significant Accounting Policies [Line Items]
Equity method investment percentage in joint venture			49.90%