CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net (loss) income	$ (213)	$ (8,949)
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Depreciation and amortization	4,740	5,674
(Recovery) provision for doubtful accounts	(9)	57
Stock-based compensation expense	1,738	703
Non-cash interest expense	3,359	3,546
Unrealized foreign currency transaction losses	(586)	1,323
Benefit for deferred taxes	(1)	(2)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	6,444	8,596
Inventories	(1,372)	(482)
Prepaid expenses and other current assets	(3,861)	(396)
Accounts payable	(810)	(2,112)
Accrued expenses, compensation and benefits and other liabilities	(2,837)	(1,355)
Income taxes payable	261	190
Deferred revenues	(477)	(1,423)
Net cash provided by (used in) operating activities	6,376	5,370
Cash flows from investing activities:
Purchases of property and equipment	(1,767)	(2,080)
Increase in other long-term assets	0	(8)
Net cash used in investing activities	(1,767)	(2,088)
Cash flows from financing activities:
Repayment of debt	(3,928)	(3,212)
Proceeds from the issuance of common stock under employee stock plans	309	6
Common stock repurchases for tax withholdings for net settlement of equity awards	(1,690)	(497)
Partial retirement of the Notes conversion feature and capped call option unwind	(22)	(20)
Net cash (used in) provided by financing activities	(5,331)	(3,723)
Effect of exchange rate changes on cash and cash equivalents	(55)	15
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(777)	(426)
Cash and cash equivalents at beginning of period	56,103
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	67,317
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents at end of period	55,326
Restricted cash	9,020
Restricted Cash, Noncurrent	2,971
Cash paid for income taxes, net of refunds	203	(2,469)
Cash paid for interest	$ 2,041	$ 1,919

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