Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (13,478)	$ (11,782)
Adjustments to reconcile net loss to net cash provided by operating activities:
Change in allowance for doubtful accounts	3,033	477
Change in the fair value of acquisition-related contingent consideration		(2,063)
Amortization and write-off of deferred financing fees	388	388
Depreciation and amortization	25,773	25,204
Stock-based compensation	3,150	3,743
Foreign exchange loss	338	21
Deferred income taxes	(464)	(446)
Other	1,109	968
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	9,345	(2,592)
Inventories	1,592	672
Prepaid expenses and other assets	1,840	(2,587)
Accounts payable and accrued liabilities	(9,416)	(2,418)
Deferred revenue	(1,313)	(287)
Other liabilities	(1,113)	1,637
Net cash provided by operating activities	20,784	10,935
Cash flows from investing activities:
Capital expenditures	(10,517)	(10,550)
Capital expenditures associated with the subscription model	(217)
Net cash used in investing activities	(10,734)	(10,550)
Cash flows from financing activities:
Purchases of common stock under share repurchase program	(2,527)
Payments under revolving credit facility	(15,000)
Proceeds under revolving credit facility	15,000
Payments under the Paycheck Protection Program	(7,588)
Proceeds under the Paycheck Protection Program	7,588
Proceeds from issuance of common stock under employee stock purchase plan	430	604
Net cash (used in) provided by financing activities	(2,097)	604
Effect of exchange rate changes on cash and cash equivalents	144	40
Net increase in cash and cash equivalents	8,097	1,029
Beginning of period	54,258	53,766
End of period	62,355	54,795
Cash paid for:
Interest	10,000	10,000
Income taxes	2,745	1,763
Noncash investing and financing activities:
Capital expenditures incurred not yet paid	1,446	854
Stock-based compensation related to capital expenditures	$ 247	$ 458