CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net loss	$ (47,174)	$ (36,255)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	24,502	20,695
Non-cash leases expense	6,830	6,059
Stock-based compensation expense, net of amounts capitalized	36,973	30,265
Deferred income taxes	195	(415)
Gain on sale of a private company investment	(1,001)	(1,001)
Other	1,678	286
Changes in assets and liabilities:
Accounts receivable	(1,506)	(2,065)
Prepaid expenses and other assets	(6,714)	(3,387)
Accounts payable and accrued liabilities	5,659	1,996
Accrued compensation	(4,408)	(6,311)
Deferred revenue	18,720	18,576
Operating lease liabilities	(7,659)	(6,731)
Net cash provided by operating activities	26,095	21,712
Cash flows from investing activities
Acquisition, net of cash acquired	0	(53,138)
Purchases of property and equipment	(772)	(1,335)
Capitalized internal-use software	(5,372)	(6,527)
Proceeds from sale of a private company investment	1,001	1,001
Net cash used in investing activities	(5,143)	(59,999)
Cash flows from financing activities
Proceeds from stock option exercises	24,279	37,593
Proceeds from employee stock purchase plan	3,082	2,662
Repayment of debt	(1,100)	(1,100)
Net cash provided by financing activities	26,261	39,155
Effect of exchange rate changes on cash	(1,090)	(55)
Net increase in cash, cash equivalents and restricted cash	46,123	813
Cash, cash equivalents and restricted cash at beginning of period	131,683	154,371
Cash, cash equivalents and restricted cash at end of period	177,806	155,184
Supplemental cash flow data:
Interest paid for term debt	5,198	6,913
Income taxes paid	394	676
Non-cash investing and financing transactions:
Fair value of common stock issued as acquisition consideration	0	30,092
Stock compensation included in capitalized software costs	1,486	2,031
Accrued unpaid capital expenditures	7	321
Lease liabilities arising from obtaining right-of-use assets, net	0	2,477
Proceeds receivable from stock option exercises	1,350	0
Derecognized financing obligation related to building due to adoption of ASC 842	0	92,009
Derecognized building due to adoption of ASC 842	$ 0	$ 71,781