Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net loss	$ (57,814)	$ (35,878)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation of property and equipment	7,775	6,438
Amortization of intangible assets	6,703	2,112
Amortization of deferred financing costs	9	15
Change in fair value of mark-to-market liabilities		(1,266)
Stock-based compensation	43,398	16,102
Other	(988)	(757)
Changes in assets and liabilities:
Accounts receivable, net	(5,711)	(14,011)
Prepaid expenses and other assets	(7,005)	(168)
Deferred commissions	(7,571)	(1,172)
Right-of-use assets	2,110
Accounts payable and accrued liabilities	8,855	10,241
Deferred revenue	39,969	37,011
Lease liabilities	(1,700)
Deferred rent		1,603
Other liabilities	3,550
Net cash provided by operating activities	31,580	20,270
Investing activities:
Purchases of property and equipment	(7,485)	(8,888)
Proceeds from sale of property and equipment	71	78
Purchases of marketable securities	(15,394)	(92,170)
Maturities of marketable securities	60,700	37,850
Sale of marketable securities	8,786
Business acquisitions, net of cash received	(55,293)
Net cash used in investing activities	(8,615)	(63,130)
Financing activities:
Proceeds from common stock offerings, net of offering costs		109,789
Proceeds from issuance of common stock from employee equity plans	7,008	8,760
Shares repurchased for tax withholdings on vesting of restricted stock	(2,094)	(333)
Payments for financing costs		(18)
Net cash provided by financing activities	4,914	118,198
Net increase in cash and cash equivalents	27,879	75,338
Cash and cash equivalents, beginning of period	94,320	35,693
Cash and cash equivalents, end of period	122,199	111,031
Supplemental cash flow disclosure:
Cash paid for taxes	217	131
Non-cash investing and financing activities:
Capital expenditures incurred but not yet paid	523	$ 192
Consideration not yet received in connection with the acquisition of Portfolium, net	(280)
Issuance of common stock for acquisition	$ 30,012