Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Activities:
Net loss	$ (17,716)	$ (11,100)
Adjustments to reconcile net loss to net cash and cash equivalents provided by operating activities
Depreciation and amortization	8,711	6,973
Stock-based compensation	27,463	21,205
Benefit for deferred income taxes	(257)	(28)
Amortization of debt discount and issuance costs	5,703	5,260
Accretion of bond discount	(2,154)	(2,751)
Unrealized currency translation	781	(281)
Changes in assets and liabilities
Accounts receivable	9,780	7,758
Prepaid expenses and other assets	(15,107)	886
Deferred commission expense	(1,523)	(3,334)
Right-of-use assets	5,723	5,505
Accounts payable	1,495	4,911
Accrued expenses and other liabilities	(5,439)	(2,071)
Operating lease liabilities	(5,281)	(4,110)
Deferred revenue	10,832	8,893
Net cash and cash equivalents provided by operating activities	23,011	37,716
Investing Activities:
Purchases of investments	(439,889)	(386,501)
Maturities of investments	382,875	183,460
Purchases of property and equipment	(11,098)	(4,265)
Capitalization of software development costs	(4,769)	(2,821)
Net cash and cash equivalents used in investing activities	(72,881)	(210,127)
Financing Activities:
Proceeds from common stock offering, net of offering costs paid of $256		342,739
Employee taxes paid related to the net share settlement of stock-based awards	(941)	(1,084)
Proceeds related to the issuance of common stock under stock plans	6,854	5,690
Repayments of finance lease obligations	(30)	(118)
Net cash and cash equivalents provided by financing activities	5,883	347,227
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(1,814)	(784)
Net increase in cash, cash equivalents and restricted cash	(45,801)	174,032
Cash, cash equivalents and restricted cash, beginning of period	278,515	117,114
Cash, cash equivalents and restricted cash, end of period	232,714	291,146
Supplemental cash flow disclosure:
Cash paid for income taxes	746	1,027
Right-of-use assets obtained in exchange for operating lease liabilities	6,396	12,410
Non-cash investing and financing activities:
Common stock offering costs, incurred but not yet paid		109
Capital expenditures incurred but not yet paid	1,204	$ 2,802
Asset retirement obligations	$ 87