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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 6 Months Ended
Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Loyalty deferred revenue
Deferred commissions were $3.2 million at each of June 30, 2017 and December 31, 2016.
Loyalty program
(in thousands)

Loyalty deferred revenue as of January 1, 2016
$
8,073

Loyalty points forfeited or expired
(6,963
)
Loyalty points used
(15,451
)
Loyalty points vested
20,085

Loyalty points unvested
1,289

Loyalty deferred revenue as of December 31, 2016
$
7,033

Loyalty deferred revenue as of January 1, 2017
$
7,033

Loyalty points forfeited or expired
(3,370
)
Loyalty points used
(6,957
)
Loyalty points vested
7,585

Loyalty points unvested
1,916

Loyalty deferred revenue as of June 30, 2017
$
6,207
Sales return reserve
For the six months ended June 30, 2017, our sales return reserve consisted of the following (in thousands):

Sales reserve as of January 1, 2017
$
129

Provision related to sales made in current period
591

Adjustment related to sales made in prior periods
3

Actual returns or credits related to current period
(457
)
Actual returns or credits related to prior periods
(132
)
Sales reserve as of June 30, 2017
$
134