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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 6 Months Ended
Jun. 30, 2020
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, 2020December 31, 2019
Cash and cash equivalents at beginning of period$24,762  $21,845  
Current restricted cash at beginning of period943  1,514  
Long-term restricted cash at beginning of period5,295  7,225  
Cash, cash equivalents, and restricted cash at beginning of period$31,000  $30,584  
Cash and cash equivalents at end of period$20,712  $24,762  
Current restricted cash at end of period943  943  
Long-term restricted cash at end of period4,242  5,295  
Cash, cash equivalents, and restricted cash at end of period$25,897  $31,000  
Loyalty deferred revenue The deferred revenue associated with the loyalty program at June 30, 2020 and December 31, 2019 was $3.1 million and $3.1 million, respectively.
Loyalty program(in thousands)
Loyalty deferred revenue as of January 1, 2019$4,231  
Loyalty points forfeited or expired(4,348) 
Loyalty points used(9,127) 
Loyalty points vested11,320  
Loyalty points unvested1,051  
Loyalty deferred revenue as of December 31, 2019$3,127  

Loyalty deferred revenue as of January 1, 2020$3,127  
Loyalty points forfeited or expired(1,659) 
Loyalty points used(4,649) 
Loyalty points vested5,124  
Loyalty points unvested1,121  
Loyalty deferred revenue as of June 30, 2020$3,064  
Sales return reserve For the six months ended June 30, 2020 our sales return reserve consisted of the following (in thousands):
Sales reserve as of January 1, 2019$76  
Provision related to sales made in current period1,037  
Adjustment related to sales made in prior periods31  
Actual returns or credits related to current period(973) 
Actual returns or credits related to prior periods(103) 
Sales reserve as of December 31, 2019$68  
Sales reserve as of January 1, 2020$68  
Provision related to sales made in current period488  
Adjustment related to sales made in prior periods4  
Actual returns or credits related to current period(411) 
Actual returns or credits related to prior periods(67) 
Sales reserve as of June 30, 2020$82  
Other Noncurrent Liabilities Other Long-Term LiabilitiesOther long-term liabilities were $7.7 million and $6.2 million as of June 30, 2020 and December 31, 2019, respectively.  As of June 30, 2020 and December 31, 2019, the balance is primarily composed of long-term operating lease obligations of $6.8 million and $5.3 million, respectively. See Note 8, Leases for more information. Additionally, as of June 30, 2020 and December 31, 2019, 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 2019 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 June 30, 2020 and December 31, 2019, accrued restoration costs related to these leases amounted to $0.3 million. At each of June 30, 2020 and December 31, 2019, 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 2019 Annual Report).