CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (23,484)	$ (25,267)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	2,980	1,933
Bad debt expense	200	97
Loss on disposal of property and equipment	22	145
Deferred income taxes	(168)	(47)
Stock-based compensation	7,090	9,914
Changes in assets and liabilities:
Accounts receivable	(2,084)	9,337
Prepaid expenses and other assets	1,922	13,453
Deferred commissions	(295)	(4,790)
Accounts payable and accrued expenses	(1,674)	5,458
Accrued compensation and related benefits	2,575	(3,181)
Other liabilities	1,271	(269)
Deferred revenue	2,310	640
Operating lease liabilities	2,378	0
Deferred rent, non-current	0	4,584
Net cash (used in) provided by operating activities	(6,957)	12,007
Cash flows from investing activities:
Payments for acquisitions, net of cash acquired	(6,138)	0
Purchases of property and equipment	(686)	(27,689)
Net cash used in investing activities	(6,824)	(27,689)
Cash flows from financing activities:
Principal payments on finance leases	(716)	0
Proceeds from public offering, net of underwriting discounts	108,260	0
Payments of costs related to public offerings	(18)	0
Proceeds from exercise of common stock options	2,242	1,987
Net cash provided by financing activities	109,768	1,987
Effect of foreign exchange rate changes on cash and cash equivalents	404	(134)
Net increase (decrease) in cash and cash equivalents	96,391	(13,829)
Cash and cash equivalents, beginning of period	159,755	94,930
Cash and cash equivalents, end of period	256,146	81,101
Supplemental disclosure of cash flow information:
Cash paid for interest	88	170
Cash paid for income taxes	139	116
Supplemental disclosure of non-cash financing information:
Capital lease obligations to acquire new office furniture and fixtures	$ 0	$ 3,673