Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (14,047)	$ (6,159)
Adjustments to reconcile net loss to net cash provided by operating activities:
Change in allowance for doubtful accounts	(100)	(24)
Change in the fair value of acquisition-related contingent consideration	(481)	29
Amortization of the fair value adjustment related to warranty liabilities acquired through acquisitions		(57)
Amortization and write off of deferred financing fees	2,718	383
Depreciation and amortization	22,422	20,510
Stock-based compensation	2,969	2,605
Foreign exchange loss	220	84
Deferred income taxes	780	623
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(9,161)	(7,294)
Inventories	(5,437)	951
Prepaid expenses and other assets	(1,114)	(3,714)
Accounts payable and accrued liabilities	(523)	1,300
Deferred revenue	(186)	(1,223)
Other liabilities	(311)	(108)
Net cash (used in) provided by operating activities	(2,251)	7,906
Cash flows from investing activities:
Acquisition of business, net of cash acquired	(34,236)	(3,452)
Capital expenditures	(14,213)	(16,864)
Change in restricted cash		1,000
Other	(250)	(198)
Net cash (used in) investing activities	(48,699)	(19,514)
Cash flows from financing activities:
Proceeds from issuance of common stock	15,000
Payment of long-term debt	(150,000)
Proceeds received from issuance of long-term debt	250,000
Cash paid for debt issuance costs	(5,359)
Proceeds from employee stock purchase plan	529
Payment of deferred purchase consideration	(347)	(342)
Net cash provided by (used in) financing activities	109,823	(342)
Effect of exchange rate changes on cash and cash equivalents	136	338
Net increase (decrease) in cash and cash equivalents	59,009	(11,612)
Beginning of period	25,023	27,077
End of period	84,032	15,465
Cash paid for
Interest	3,411	4,400
Income taxes	476	(101)
Noncash investing and financing activities:
Capital expenditures incurred not yet paid	942	1,817
Capital expenditure milestone payable incurred not yet paid		5,070
Stock-based compensation related to capital expenditures	243	131
Common stock issued in connection with the acquisition of businesses	764
Common stock issued as payment for contingent consideration	347	352
Acquisition-related contingent consideration	$ 9,835	$ 514