Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (64,114)	$ (35,046)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	4,320	2,480
Stock-based compensation	34,779	24,174
Amortization of deferred commissions	10,530	9,718
Amortization of operating lease right-of-use asset	7,009	0
Capital loss (gain) from sale of fixed assets	24	(27)
Changes in assets and liabilities:
Trade receivables	31,357	22,658
Prepaid expenses and other current assets	(2,239)	(927)
Deferred commissions	(13,401)	(9,864)
Other long term assets	50	5
Trade payables	379	2,510
Accrued expenses and other short-term liabilities	(7,675)	1,922
Deferred revenues	(11,749)	(1,183)
Other long term liabilities	54	(155)
Net cash provided by (used in) operating activities	(10,676)	16,265
Cash flows from investing activities:
Decrease (increase) in short-term deposits	33,474	(10,213)
Increase in marketable securities	(1,627)	(120)
Increase in long-term deposits	(16)	(319)
Proceeds from sale of property and equipment	10	27
Purchase of property and equipment	(14,219)	(3,177)
Net cash provided by (used in) investing activities	17,622	(13,802)
Cash flows from financing activities:
Proceeds (withholdings) from employee stock plans, net	(2,669)
Proceeds (withholdings) from employee stock plans, net		8,169
Net cash provided (used in) by financing activities	(2,669)	8,169
Increase in cash, cash equivalents and restricted cash	4,277	10,632
Cash, cash equivalents and restricted cash at beginning of period	48,707	57,236
Cash, cash equivalents and restricted cash at end of period	52,984	67,868
Supplemental disclosure of cash flow information:
Cash paid for income taxes	3,566	$ 561
Net lease liabilities arising from obtaining right-of-use assets	$ 8,908