Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net loss	$ (10,480)	$ (5,163)
Adjustments to reconcile net loss to net cash (used in) operating activities
Depreciation of property and equipment	725	669
Amortization of line of credit issuance costs	65	47
Amortization of acquired intangible assets	357	385
Amortization of deferred commissions	1,627	1,020
Amortization of right-of-use operating lease asset	309	317
Stock-based compensation expense	3,522	0
Provision for accounts receivable allowances	910	222
Changes in operating assets and liabilities
Accounts receivable	(2,122)	(768)
Prepaid expenses and other current assets	(313)	(102)
Deferred commissions	(2,500)	(1,228)
Accounts payable and accrued expenses	(305)	(1,518)
Deferred revenue	4,299	2,565
Lease liabilities	(597)	(319)
Net cash (used in) operating activities	(4,503)	(3,873)
Cash flows from investing activities
Purchases of property and equipment	(313)	(156)
Net cash (used in) investing activities	(313)	(156)
Cash flows from financing activities
Proceeds from underwriters' purchase of over-allotment shares, related to the Company's initial public offering, net of underwriters’ discounts and commissions	9,954	0
Payments for line of credit issuance costs	(132)	(47)
Proceeds from exercise of stock options	142	6
Employee taxes paid related to the net share settlement of stock-based awards	(3,082)	0
Payments of deferred offering costs	0	(202)
Net cash provided by (used in) financing activities	6,882	(243)
Net increase (decrease) in cash and cash equivalents	2,066	(4,272)
Cash and cash equivalents
Beginning of period	135,310	26,190
End of period	137,376	21,918
Supplemental noncash disclosures
Operating lease liability arising from operating ROU asset obtained	5,481	0
Noncash exercise of stock warrants	140
Deferred offering costs, accrued but not yet paid	$ 216	$ 37