Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net loss	$ (22,639)	$ (15,046)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	1,337	797
Stock-based compensation	8,961	6,927
Amortization of deferred commissions	3,626	3,325
Amortization of operating lease right-of-use asset	1,399	0
Capital gain from disposal of fixed assets	24	0
Changes in assets and liabilities:
Trade receivables	41,427	43,128
Prepaid expenses and other current assets	(623)	(5,806)
Deferred commissions	(4,870)	(2,434)
Other long term assets	(19)	41
Trade payables	(1,996)	(152)
Accrued expenses and other short term liabilities	(7,358)	(8,200)
Deferred revenues	(5,384)	(5,373)
Other long term liabilities	170	237
Net cash provided by operating activities	14,055	17,444
Cash flows from investing activities:
Decrease (increase) in short-term deposits	9,120	(1,144)
Decrease (increase) in marketable securities	1,928	(1,889)
Increase in long-term deposits	(12)	(308)
Purchase of property and equipment	(5,103)	(1,081)
Net cash provided by (used in) investing activities	5,933	(4,422)
Cash flows from financing activities:
Proceeds (withholdings) from employee stock plans, net		1,066
Proceeds (withholdings) from employee stock plans, net	(4,234)
Net cash provided (used in) by financing activities	(4,234)	1,066
Increase in cash, cash equivalents and restricted cash	15,754	14,088
Cash, cash equivalents and restricted cash at beginning of period	48,707	57,236
Cash, cash equivalents and restricted cash at end of period	64,461	71,324
Supplemental disclosure of cash flow information:
Cash paid for income taxes	2,543	$ 102
Initial recognition of operating lease right-of-use assets	51,875
Initial recognition of operating lease liabilities	$ 56,165