CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating activities:
Net loss	$ (60,986)	$ (28,256)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	4,907	4,368
Goodwill impairment	50,300	0
Stock-based compensation	9,559	11,847
Amortization and impairment of deferred commissions	5,517	7,403
Amortization and impairment of deferred professional service costs	2,417	3,110
Non-cash operating lease expense	3,765	3,919
Accretion and amortization of marketable securities	2	(244)
Changes in operating assets and liabilities:
Accounts receivable and other, net	926	(8,626)
Deferred commissions	(1,396)	(4,503)
Deferred professional service costs	(918)	(1,301)
Prepaid expenses and other assets	242	(822)
Accounts payable	(14,048)	2,378
Operating lease liabilities	(4,186)	(4,267)
Accrued expenses and other liabilities	(2,576)	(3,072)
Deferred revenue	(100)	(2,890)
Accrued compensation	(1,949)	(428)
Net cash used in operating activities	(8,524)	(21,384)
Investing activities:
Purchase of property and equipment	(3,431)	(712)
Purchase of marketable securities	(2,994)	(23,069)
Sales of marketable securities	2,001	0
Maturities of marketable securities	17,400	14,670
Net cash provided by (used in) investing activities	12,976	(9,111)
Financing activities:
Proceeds from exercise of stock options	178	1,924
Proceeds from ESPP offering	371	0
Principal payments on debt	(1,395)	(1,394)
Net cash (used in) provided by financing activities	(846)	530
Net increase (decrease) in cash, cash equivalents and restricted cash	3,606	(29,965)
Cash, cash equivalents and restricted cash at beginning of period	44,342	67,330
Cash, cash equivalents and restricted cash at end of period	47,948	37,365
Reconciliation of cash, cash equivalents and restricted cash:
Total cash, cash equivalents and restricted cash	$ 47,948	$ 37,365