Share-based Compensation - Schedule of Grants of RSUs with both Time- and Performance-based Conditions (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			2 years
Amortization of share-based compensation		$ 5,386	$ 5,505
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period			4 years
Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares granted in accordance with 2018 Plan			2,442,000
Amortization of share-based compensation of RSUs with both time- and performance-based conditions		$ 5	$ 775
Performance Based Restricted Stock Units | Criteria One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant dates	[1]	9/5/2018 - 1/16/2019
Shares granted in accordance with 2018 Plan	[1]	1,577,500
Weighted average grant-date fair value	[1]	$ 7.66
Amortization of share-based compensation	[1]	$ 0	6
Performance Based Restricted Stock Units | Criteria One | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	[1]	3 years
Performance Based Restricted Stock Units | Criteria One | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	[1]	4 years
Performance Based Restricted Stock Units | Criteria Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant dates	[2]	8/28/2019 - 9/8/2020
Shares granted in accordance with 2018 Plan	[2]	277,500
Weighted average grant-date fair value	[2]	$ 12.27
Amortization of share-based compensation	[2]	$ 5	278
Performance Based Restricted Stock Units | Criteria Two | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	[2]	3 years
Performance Based Restricted Stock Units | Criteria Two | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	[2]	4 years
Performance Based Restricted Stock Units | Criteria Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant dates	[3]	8/28/2019 - 11/20/2020
Shares granted in accordance with 2018 Plan	[3]	455,000
Weighted average grant-date fair value	[3]	$ 15.44
Vesting period	[3]	3 years
Amortization of share-based compensation	[3]	$ 0	491
Performance Based Restricted Stock Units | Criteria Four
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant dates	[4]	7/30/2021
Shares granted in accordance with 2018 Plan	[4]	120,000
Weighted average grant-date fair value	[4]	$ 15.13
Vesting period	[4]	5 years
Amortization of share-based compensation	[4]	$ 0	$ 0
Performance Based Restricted Stock Units | Criteria Five
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant dates	[3]	9/12/2023
Shares granted in accordance with 2018 Plan	[3]	12,000
Weighted average grant-date fair value	[3]	$ 20.39
Vesting period	[3]	3 months 18 days

[1] Such RSU grants shall not vest unless and until the Company has, for any fiscal quarter in which the RSUs are outstanding, achieved certain performance criteria in gross revenue and positive adjusted EBITDA. Provided the performance criteria are met, the RSUs will vest in accordance with the time-based requirements contained in the award agreement over three or four years. As of June 30, 2019, the Company determined that the Criteria One was met. As of December 31, 2022, all shares underlying such awards have vested and been issued in accordance with their time-based vesting requirement.

[2] Such RSU grants shall not vest unless and until the Company has, for any fiscal quarter in which the RSUs are outstanding, achieved certain performance criteria in gross revenue and positive adjusted EBITDA. Provided the performance criteria are met, the RSUs will vest in accordance with the time-based requirements contained in the award agreement over three or four years. The Company determined that Criteria Two was met as of March 31, 2021. As of December 31, 2023, all shares underlying such awards are expected to vest and be issued in accordance with their time-based vesting requirement.

[3] Such RSU grants shall not vest unless and until the Company has, for any fiscal quarter in which the RSUs are outstanding, achieved certain performance criteria in gross revenue and positive adjusted EBITDA. Provided the respective performance criteria are met, the RSUs will vest in accordance with the time-based requirements contained in the award agreement over three years. As of the respective grant dates, the Company determined that it was probable that the Criteria Three would be met and therefore, began to record the related amortization expense on the grant dates. The Company determined that the performance criteria were met as of March 31, 2022. As of December 31, 2023, all shares underlying such awards are expected to vest and be issued in accordance with their time-based vesting requirement.

[4] On July 30, 2021, the Company granted 120,000 RSUs, subject to performance-based requirements, to one non-executive employee, which was subsequently modified on November 7, 2022, with a fair value of $15.13 per share as of the modification date. Such RSU grants shall not vest unless and until the Company has achieved certain revenue for a portion of its business prior to the achievement date deadline for each performance milestone. As of December 31, 2023, the Company determined that a total of 24,000 RSUs have forfeited as related performance milestones were not met, unless there is a change in control on or prior to June 30, 2026. No amortization of share-based compensation expense has been recognized for the remaining RSUs, because, as of December 31, 2023, the Company determined that it is not probable that any performance criteria will be met in the future. The remaining 96,000 RSUs, which were subsequently forfeited as a result of the termination of employment of the non-executive employee on February 2, 2024, were included in "Unvested as of December 31, 2023" with a fair value of $15.13 per share. (5) On September 12, 2023, the Company granted 12,000 RSUs, subject to performance-based requirements, to one non-executive employee, with a grant date fair value of $20.93 per share. Such RSU grants shall not vest unless and until the Company has achieved certain revenue for a portion of its business for the period from July 1, 2023 to December 31, 2023. No amortization of share-based compensation expense has been recognized for these RSUs, because, as of December 31, 2023, the Company determined that such performance criteria were not met. The 12,000 RSUs were included in "Forfeited" during the year ended December 31, 2023.