Condensed Consolidated Statements of Cash Flows $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)
Cash flows from operating activities:
Net loss	$ (17,165)	$ (14,047)
Adjustments to reconcile net loss to net cash provided by operating activities:
Change in allowance for doubtful accounts	1,823	(100)
Change in the fair value of acquisition-related contingent consideration	(1,322)	(481)
Amortization and write-off of deferred financing fees	388	2,718
Depreciation and amortization	24,065	22,422
Stock-based compensation	3,435	2,969
Foreign exchange (gain) loss	(116)	220
Deferred income taxes	(1,056)	780
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(8,377)	(9,161)
Inventories	(2,255)	(5,437)
Prepaid expenses and other assets	1,861	(1,114)
Accounts payable and accrued liabilities	(13,382)	(523)
Deferred revenue	128	(186)
Other liabilities	(541)	(311)
Net cash used in operating activities	(12,514)	(2,251)
Cash flows from investing activities:
Acquisition of business, net of cash acquired		(34,236)
Capital expenditures	(11,773)	(14,213)
Other		(250)
Net cash used in investing activities	(11,773)	(48,699)
Cash flows from financing activities:
Proceeds from public offering of common stock, net of underwriters’ discounts and commissions and offering costs of $1,705	27,967
Proceeds from private offering of common stock		15,000
Payment of long-term debt		(150,000)
Proceeds from issuance of long-term debt		250,000
Payments under revolving credit facility	(14,000)
Proceeds under revolving credit facility	14,000
Cash paid for debt issuance costs		(5,359)
Proceeds from issuance of common stock under employee stock purchase plan	668	529
Payment of deferred purchase consideration		(347)
Net cash provided by financing activities	28,635	109,823
Effect of exchange rate changes on cash and cash equivalents	(151)	136
Net increase in cash and cash equivalents	4,197	59,009
Beginning of period	34,830	25,023
End of period	39,027	84,032
Cash paid for
Interest	10,036	3,411
Income taxes		476
Noncash investing and financing activities:
Capital expenditures incurred not yet paid	689	942
Stock-based compensation related to capital expenditures	244	243
Series A convertible preferred stock dividend paid in kind	$ 11
Common stock issued in connection with the acquisition of businesses		764
Common stock issued as payment for contingent consideration		347
Acquisition-related contingent consideration		$ 9,835