CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net loss	$ (10,573)	$ (7,463)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	1,142	903
Stock-based compensation expense	9,936	8,193
Provision for (recovery of) doubtful accounts	40	(187)
Amortization (accretion) of premiums and discounts on marketable securities, net	101	(81)
Amortization of debt discount and issuance costs	2,197	0
Deferred income tax	0	(18)
Changes in assets and liabilities:
Accounts receivable	14,265	14,818
Deferred commissions	603	(2,029)
Operating lease right-of-use asset	1,098	668
Other receivables	(253)	(214)
Prepaid expenses and other	(1,955)	(3,236)
Other assets	(74)	(1,464)
Accounts payable	(1,382)	(1,562)
Deferred revenue	(1,228)	1,987
Operating lease liability	(1,145)	(655)
Accrued expenses and other liabilities	(8,023)	(4,541)
Net cash provided by operating activities	4,749	5,119
Cash flows from investing activities
Purchase of property and equipment	(688)	(1,743)
Purchase of marketable securities	(20,832)	(22,155)
Sale of marketable securities	11,423	0
Maturities of marketable securities	12,975	7,390
Purchase of intangible assets	(77)	(84)
Net cash provided by (used in) investing activities	2,801	(16,592)
Cash flows from financing activities
Proceeds from option exercises	2,794	11,055
Taxes paid related to net share settlements of stock-based compensation awards	(1,379)	(390)
Proceeds from shares issued in connection with employee stock purchase plan	3,660	2,149
Principal payments on financing obligations	(320)	(294)
Net cash provided by financing activities	4,755	12,520
Effect of foreign exchange rates on cash	(613)	105
Net increase in cash and cash equivalents	11,692	1,152
Cash and cash equivalents at beginning of period	381,742	77,584
Cash and cash equivalents at end of period	393,434	78,736
Supplemental cash flow disclosure
Cash paid for interest	2,320	464
Cash paid for income taxes, net of refunds	159	233
Supplemental disclosure of noncash investing and financing activities
Allowance for tenant improvements	$ 124	$ 0