CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 2,155	$ 4,303
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	1,196	1,092
Deferred income tax benefit	(297)	(1,460)
Stock-based compensation	1,064	691
Other expense (income)	10	(1)
Changes in operating assets and liabilities:
Accounts receivable	1,425	6,937
Inventories	2,047	(4,824)
Due from related parties	1	(16)
Lease receivable, current	(233)	(340)
Other current assets	108	(20)
Accounts payable	(3,265)	(337)
Due to related parties	(1,026)	(1,389)
Accrued liabilities and other	3,022	(247)
Lease receivable, non-current	(754)	(1,568)
Other non-current assets	(138)	(459)
Deferred revenue and other	(1,108)	(431)
Net cash provided by operating activities	4,207	1,931
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(375)	(480)
Net cash used in investing activities	(375)	(480)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock	288	713
Repurchase of common stock	(1,571)	(860)
Proceeds from line of credit borrowings	0	7,970
Repayments of line of credit borrowings	0	(7,862)
Distributions to non-controlling interest members	(126)	0
Repayments of other debt	0	(64)
Net cash used in financing activities	(1,409)	(103)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	44	41
INCREASE IN CASH AND CASH EQUIVALENTS	2,467	1,389
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	9,659	10,794
CASH AND CASH EQUIVALENTS, END OF PERIOD	12,126	12,183
Supplemental Cash Flow Information [Abstract]
Non-cash transfers of equipment between inventory and property and equipment, net	$ 251	$ 402