CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net loss	$ (29,647)	$ (24,250)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	10,694	12,288
Non-cash leases expense	3,340	3,423
Stock-based compensation expense, net of amounts capitalized	23,599	17,502
Deferred income taxes	99	97
Bad debt expense	307	421
Gain on sale of a private company investment	0	(1,001)
Other	508	317
Changes in assets and liabilities:
Accounts receivable	(76)	(1,953)
Prepaid expenses and other assets	(4,682)	(2,208)
Accounts payable and accrued liabilities	9,251	2,647
Accrued compensation	(9,274)	(10,452)
Deferred revenue	16,985	11,229
Operating lease liabilities	(3,786)	(3,827)
Net cash provided by operating activities	17,318	4,233
Cash flows from investing activities
Purchases of property and equipment	0	(406)
Capitalized internal-use software	(2,268)	(2,946)
Proceeds from sale of a private company investment	0	1,001
Net cash used in investing activities	(2,268)	(2,351)
Cash flows from financing activities
Proceeds from stock option exercises	9,553	13,815
Repayment of debt	(550)	(550)
Net cash provided by financing activities	9,003	13,265
Effect of exchange rate changes on cash	(309)	(1,267)
Net increase in cash, cash equivalents and restricted cash	23,744	13,880
Cash, cash equivalents and restricted cash at beginning of period	224,614	131,683
Cash, cash equivalents and restricted cash at end of period	248,358	145,563
Supplemental cash flow data:
Interest paid for term debt	2,177	2,967
Non-cash investing transactions:
Stock compensation included in capitalized software costs	559	776
Accrued unpaid capital expenditures	547	204
Lease liabilities arising from obtaining right-of-use assets, net	$ 2,676	$ 0