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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 6 Months Ended
Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Reconciliation of cash, cash equivalents, and restricted cash
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Company's consolidated balance sheets to the total amount presented in the consolidated statement of cash flows (in thousands):
June 30, 2023December 31, 2022
Cash and cash equivalents at beginning of period$13,777 $24,185 
Current restricted cash at beginning of period944 944 
Long-term restricted cash at beginning of period476 503 
Cash, cash equivalents, and restricted cash at beginning of period$15,197 $25,632 
Cash and cash equivalents at end of period$9,374 $13,777 
Current restricted cash at end of period938 944 
Long-term restricted cash at end of period460 476 
Cash, cash equivalents, and restricted cash at end of period$10,772 $15,197 
Loyalty deferred revenue
The deferred revenue associated with the loyalty program at each of June 30, 2023 and December 31, 2022 was $2.6 million and $4.2 million, respectively.

Loyalty program(in thousands)
Loyalty deferred revenue as of January 1, 2022$4,292 
Loyalty points forfeited or expired(3,387)
Loyalty points used(10,543)
Loyalty points vested12,773 
Loyalty points unvested1,032 
Loyalty deferred revenue as of December 31, 2022$4,167 

Loyalty deferred revenue as of January 1, 2023$4,167 
Loyalty points forfeited or expired(2,736)
Loyalty points used(4,672)
Loyalty points vested5,010 
Loyalty points unvested828 
Loyalty deferred revenue as of June 30, 2023$2,597 
Sales return reserve , our sales return reserve consisted of the following (in thousands):
Sales reserve as of January 1, 2022$55 
Provision related to sales made in current period783 
Adjustment related to sales made in prior periods(4)
Actual returns or credits related to current period(730)
Actual returns or credits related to prior periods(45)
Sales reserve as of December 31, 2022$59 
Sales reserve as of January 1, 2023$59 
Provision related to sales made in current period427 
Adjustment related to sales made in prior periods414 
Actual returns or credits related to current period(363)
Actual returns or credits related to prior periods(467)
Sales reserve as of June 30, 2023$70 
Other Noncurrent Liabilities Other Long-Term LiabilitiesOther long-term liabilities were $4.4 million and $5.0 million as of June 30, 2023 and December 31, 2022, respectively. As of June 30, 2023 and December 31, 2022, the balance is primarily composed of long-term operating lease obligations of $3.5 million and $4.2 million, respectively. See Note 8, Leases, for more information. Certain operating leases for the Company’s regional office facilities contain a restoration clause that requires the Company to restore the premises to its original condition. At each of June 30, 2023 and December 31, 2022, accrued restoration costs related to these leases amounted to $0.3 million. At each of June 30, 2023 and December 31, 2022, the Company also recorded a long-term liability for estimated defined benefit obligation related to a non-U.S. defined benefit plan for its Japan operations of $0.2 million (see Note 9, Employee Benefit Plans, of the Company’s 2022 Annual Report).