ACCOUNTS RECEIVABLE (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ACCOUNTS RECEIVABLE
Accounts receivable, gross	$ 30,141	$ 16,593
Less: allowance for doubtful accounts	(1,999)	(465)
Accounts receivable, net	28,142	16,128
Credit card receivables
ACCOUNTS RECEIVABLE
Accounts receivable, gross	10,243	7,570
Accounts receivable, trade
ACCOUNTS RECEIVABLE
Accounts receivable, gross	9,054	5,004
Rebate receivable
ACCOUNTS RECEIVABLE
Accounts receivable, gross	7,106	1,683
Other receivables
ACCOUNTS RECEIVABLE
Accounts receivable, gross	$ 3,738	$ 2,336