Unaudited Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net loss	$ (35,046)	$ (20,664)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	2,480	1,970
Stock-based compensation	24,174	14,445
Amortization of deferred commissions	9,718	9,292
Capital gain from disposal of fixed assets	(27)	(14)
Changes in assets and liabilities:
Trade receivables	22,658	9,181
Prepaid expenses and other current assets	(927)	(838)
Deferred commissions	(9,864)	(9,511)
Other long term assets	5	0
Trade payables	2,510	78
Accrued expenses and other short term liabilities	1,922	4,167
Deferred revenues	(1,183)	3,161
Other long term liabilities	(155)	(421)
Net cash provided by operating activities	16,265	10,846
Cash flows from investing activities:
Increase in short-term investments	(10,333)	(9,473)
Increase in long-term deposits	(319)	(209)
Proceeds from sale of property and equipment	27	14
Purchase of property and equipment	(3,177)	(3,572)
Net cash used in investing activities	(13,802)	(13,240)
Cash flows from financing activities:
Proceeds from employee stock plans, net	8,169	7,600
Net cash provided by financing activities	8,169	7,600
Increase in cash, cash equivalents and restricted cash	10,632	5,206
Cash, cash equivalents and restricted cash at beginning of period	57,236	48,803
Cash, cash equivalents and restricted cash at end of period	67,868	54,009
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 561	$ 278