CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ (5,857)	$ (213)
Adjustments to reconcile net (loss) income to net cash provided by (used in) operating activities:
Depreciation and amortization	2,142	4,740
Recovery from doubtful accounts	497	(9)
Stock-based compensation expense	2,109	1,738
Non-cash interest expense	2,820	3,359
Unrealized foreign currency transaction losses (gains)	51	(586)
Provision for (benefit from) deferred taxes	(207)	(1)
Changes in operating assets and liabilities, net of effects from acquisitions:
Accounts receivable	13,311	6,444
Inventories	(3,435)	(1,372)
Prepaid expenses and other assets	(1,631)	(3,861)
Accounts payable	(4,858)	(810)
Accrued expenses, compensation and benefits and other liabilities	(5,323)	(2,837)
Income taxes payable	40	261
Deferred revenue and contract assets	(5,264)	(477)
Net cash provided by (used in) operating activities	(5,605)	6,376
Cash flows from investing activities:
Purchases of property and equipment	(1,479)	(1,767)
Net cash used in investing activities	(1,479)	(1,767)
Cash flows from financing activities:
Proceeds from long-term debt	22,000	0
Repayment of debt	(351)	(3,928)
Proceeds from the issuance of common stock under employee stock plans	0	309
Common stock repurchases for tax withholdings for net settlement of equity awards	(1,818)	(1,690)
Partial unwind capped call cash receipt	0	(22)
Net cash (used in) provided by financing activities	19,831	(5,331)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(402)	(55)
Net increase (decrease) in cash, cash equivalents and restricted cash	12,345	(777)
Cash, cash equivalents and restricted cash at beginning of period	72,575	68,094
Cash, cash equivalents and restricted cash at end of period	84,920	67,317
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents at end of period	81,182	55,326
Restricted cash	1,663	9,020
Restricted cash included in other long-term assets	2,075	2,971
Cash paid (refunded) for income taxes	391	203
Cash paid for interest	$ 4,450	$ 2,041

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