Unaudited Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net loss	$ (27,729,000)	$ (17,400,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation	1,626,000	1,284,000
Stock-based compensation	15,775,000	9,663,000
Amortization of deferred commissions	6,441,000	6,041,000
Capital gain from disposal of fixed assets	(2,000)	(2,000)
Changes in assets and liabilities:
Trade receivables	34,203,000	12,548,000
Prepaid expenses and other current assets	(3,566,000)	(1,783,000)
Deferred commissions	(5,824,000)	(5,902,000)
Other long term assets	16,000	0
Trade payables	1,264,000	60,000
Accrued expenses and other short term liabilities	217,000	2,769,000
Deferred revenues	(2,164,000)	838,000
Other long term liabilities	126,000	(732,000)
Net cash provided by operating activities	20,383,000	7,384,000
Cash flows from investing activities:
Increase in short-term investments	(5,166,000)	(2,556,000)
Increase in long-term deposits	(318,000)	(160,000)
Proceeds from sale of property and equipment	2,000	2,000
Purchase of property and equipment	(2,072,000)	(2,534,000)
Net cash used in investing activities	(7,554,000)	(5,248,000)
Cash flows from financing activities:
Proceeds from employee stock plans, net	4,091,000	3,137,000
Net cash provided by financing activities	4,091,000	3,137,000
Increase in cash, cash equivalents and restricted cash	16,920,000	5,273,000
Cash, cash equivalents and restricted cash at beginning of period	57,236,000	48,803,000
Cash, cash equivalents and restricted cash at end of period	74,156,000	54,076,000
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 486,000	$ 140,000