Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net income	$ 11,311	$ 3,284
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,043	12,637
Loss on disposal of property and equipment	0	355
Share-based compensation expense	10,659	8,410
Deferred income taxes	(1,149)	3,075
Amortization of operating lease right-of-use assets	2,682	2,602
Amortization of debt issuance costs	241	573
Changes in operating assets and liabilities:
Accounts receivable and unbilled receivables	(16,052)	(7,251)
Inventories	(5,734)	(2,936)
Prepaid expenses	323	3,652
Other current assets	968	373
Investment in sales-type leases	(268)	(2,641)
Prepaid commissions	2,881	2,474
Other long-term assets	(2,844)	5,206
Accounts payable	208	(233)
Accrued compensation	(9,165)	(12,604)
Accrued liabilities	2,734	127
Deferred revenues	16,868	7,989
Operating lease liabilities	(2,784)	(2,669)
Other long-term liabilities	309	4,074
Net cash provided by operating activities	25,231	26,497
Investing Activities
Software development for external use	(10,602)	(11,717)
Purchases of property and equipment	(3,173)	(4,980)
Net cash used in investing activities	(13,775)	(16,697)
Financing Activities
Repayment of debt and revolving credit facility	(50,000)	(39,000)
At the market equity offering, net of offering costs	0	20,216
Proceeds from issuances under stock-based compensation plans	17,659	20,526
Employees’ taxes paid related to restricted stock units	(1,425)	(1,920)
Net cash used in financing activities	(33,766)	(178)
Effect of exchange rate changes on cash and cash equivalents	(820)	430
Net increase (decrease) in cash and cash equivalents	(23,130)	10,052
Cash and cash equivalents at beginning of period	127,210	67,192
Cash and cash equivalents at end of period	104,080	77,244
Supplemental disclosure of non-cash activities
Unpaid purchases of property and equipment	944	1,454
Property and equipment transferred to inventory	0	105
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 792	$ 431