Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (4,008)	$ (11,457)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	15,649	15,473
Stock-based compensation	5,394	6,590
Other	(561)	813
Changes in operating assets and liabilities:
Accounts receivable	(4,980)	(2,315)
Inventory	(12,533)	(8,023)
Prepaid expenses and other assets	150	169
Accounts payable	2,785	(641)
Accrued expenses and other liabilities	276	(2,036)
Deferred revenues	991	(957)
Net cash provided by (used in) operating activities	3,163	(2,384)
Cash flows from investing activities:
Cash paid for acquisitions, net of cash acquired	(513)	0
Purchases of property and equipment	(5,466)	(4,181)
Net cash used in investing activities	(5,979)	(4,181)
Cash flows from financing activities:
Issuance of shares under stock incentive plans, net of payroll taxes paid	1,897	1,974
Investment by noncontrolling interest holder	979	471
Proceeds from loans and lines of credit	0	1,275
Repayments on loans and lines of credit	(156)	(44)
Repayments on capital leases	(803)	(722)
Net cash provided by financing activities	1,917	2,954
Foreign exchange effect on cash and cash equivalents	293	(923)
Decrease in cash and cash equivalents	(606)	(4,534)
Cash and cash equivalents, beginning of period	59,065	52,884
Cash and cash equivalents, end of period	$ 58,459	$ 48,350