CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net loss	$ (52,565)	$ (129,542)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	32,243	35,120
Non-cash leases expense	9,185	0
Stock-based compensation expense, net of amounts capitalized	45,047	116,104
Amortization of debt discount and issuance costs	225	726
Deferred income taxes	(1,866)	431
Gain on sale of a private company investment	(1,001)	(999)
Other	143	234
Changes in assets and liabilities:
Accounts receivable	(1,073)	(1,822)
Prepaid expenses and other assets	(2,908)	(5,451)
Accounts payable and accrued liabilities	5,955	4,596
Accrued interest on financing lease obligation, net of payments	0	(1,036)
Accrued compensation	(1,401)	(648)
Deferred revenue	23,486	16,269
Operating lease liabilities	(10,237)	0
Net cash provided by operating activities	45,233	33,982
Cash flows from investing activities
Acquisitions, net of cash acquired	(114,603)	0
Purchases of property and equipment	(2,026)	(8,811)
Capitalized internal-use software	(9,593)	(8,857)
Proceeds from sale of a private company investment	1,001	999
Net cash used in investing activities	(125,221)	(16,669)
Cash flows from financing activities
Proceeds from initial public offering, net	0	232,509
Payments of deferred offering costs	0	(1,487)
Proceeds from stock option exercises	41,846	440
Proceeds from employee stock purchase plan	2,662	0
Employee payroll taxes paid for net share settlement of restricted stock units	0	(24,566)
Payments to repurchase common stock	0	(16)
Repayment of debt	(1,650)	(2,250)
Net cash provided by financing activities	42,858	204,630
Effect of exchange rate changes on cash	(435)	0
Net increase (decrease) in cash, cash equivalents and restricted cash	(37,565)	221,943
Cash, cash equivalents and restricted cash at beginning of period	154,371	35,345
Cash, cash equivalents and restricted cash at end of period	116,806	257,288
Supplemental cash flow data:
Interest paid for term debt	10,391	16,445
Interest paid for financing obligation on leased facility	0	6,114
Cash paid for operating leases	10,124	0
Income taxes paid	756	246
Non-cash investing and financing transactions:
Fair value of common stock issued as acquisition consideration	36,204	0
Stock compensation included in capitalized software costs	2,889	1,251
Accrued unpaid capital expenditures	277	600
Lease liabilities arising from obtaining right-of-use assets	7,548	0
Accrued unpaid payroll taxes related to net share settlement and offering costs	0	6,924
Derecognized financing obligation related to building due to adoption of ASC 842	92,009	0
Derecognized building due to adoption of ASC 842	$ 71,781	$ 0