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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 3 Months Ended
Mar. 31, 2021
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):
March 31, 2021December 31, 2020
Cash and cash equivalents at beginning of period$22,207 $24,762 
Current restricted cash at beginning of period944 943 
Long-term restricted cash at beginning of period4,346 5,295 
Cash, cash equivalents, and restricted cash at beginning of period$27,497 $31,000 
Cash and cash equivalents at end of period$23,576 $22,207 
Current restricted cash at end of period944 944 
Long-term restricted cash at end of period3,126 4,346 
Cash, cash equivalents, and restricted cash at end of period$27,646 $27,497 
Loyalty deferred revenue The deferred revenue associated with the loyalty program at March 31, 2021 and December 31, 2020 was $4.2 million and $4.5 million, respectively.
Loyalty program(in thousands)
Loyalty deferred revenue as of January 1, 2020$3,127 
Loyalty points forfeited or expired(3,249)
Loyalty points used(9,385)
Loyalty points vested12,771 
Loyalty points unvested1,223 
Loyalty deferred revenue as of December 31, 2020$4,487 

Loyalty deferred revenue as of January 1, 2021$4,487 
Loyalty points forfeited or expired(1,151)
Loyalty points used(2,327)
Loyalty points vested2,117 
Loyalty points unvested1,111 
Loyalty deferred revenue as of March 31, 2021$4,237 
Sales return reserve For the three months ended March 31, 2021 our sales return reserve consisted of the following (in thousands):
Sales reserve as of January 1, 2020$68 
Provision related to sales made in current period1,028 
Adjustment related to sales made in prior periods5 
Actual returns or credits related to current period(959)
Actual returns or credits related to prior periods(71)
Sales reserve as of December 31, 2020$71 
Sales reserve as of January 1, 2021$71 
Provision related to sales made in current period262 
Adjustment related to sales made in prior periods(14)
Actual returns or credits related to current period(179)
Actual returns or credits related to prior periods(54)
Sales reserve as of March 31, 2021$86 
Other Noncurrent Liabilities Other Long-Term LiabilitiesOther long-term liabilities were $6.4 million and $7.2 million as of March 31, 2021 and December 31, 2020, respectively.  As of March 31, 2021 and December 31, 2020, the balance is primarily composed of long-term operating lease obligations of $5.4 million and $6.1 million, respectively. See Note 8, Leases for more information. Additionally, as of March 31, 2021 and December 31, 2020, the Company recorded $0.2 million in other long-term liabilities related to uncertain income tax positions (see Note 7, Income Taxes, of the Company’s 2020 Annual Report). 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 March 31, 2021 and December 31, 2020, accrued restoration costs related to these leases amounted to $0.3 million. At each of March 31, 2021 and December 31, 2020, 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 $0.3 million (see Note 9, Employee Benefit Plans, of the Company’s 2020 Annual Report).