Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (10,063)	$ (3,301)
Adjustments to reconcile net loss to net cash provided by operating activities:
Change in allowance for doubtful accounts	881	(36)
Change in the fair value of acquisition-related contingent consideration	(1,508)	(495)
Amortization and write off of deferred financing fees	194	229
Depreciation and amortization	12,223	11,022
Stock-based compensation	1,707	1,524
Foreign exchange loss (gain)	176	(26)
Deferred income taxes	779	155
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(2,155)	(6,399)
Inventories	(5,549)	(151)
Prepaid expenses and other assets	1,070	1,768
Accounts payable and accrued liabilities	2,076	(3,461)
Deferred revenue	(578)	(229)
Other liabilities	(435)	(98)
Net cash (used in) provided by operating activities	(1,182)	502
Cash flows from investing activities:
Capital expenditures	(5,623)	(5,645)
Net cash (used in) investing activities	(5,623)	(5,645)
Cash flows from financing activities:
Effect of exchange rate changes on cash and cash equivalents	200	75
Net decrease in cash and cash equivalents	(6,605)	(5,068)
Beginning of period	34,830	25,023
End of period	28,225	19,955
Cash paid for
Interest		2,194
Noncash investing and financing activities:
Capital expenditures incurred not yet paid	1,314	1,391
Stock-based compensation related to capital expenditures	$ 159	$ 131