CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net loss	$ (60,539)	$ (18,920)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,144	2,687
Goodwill impairment	50,300	0
Stock-based compensation	6,455	8,834
Amortization and impairment of deferred commissions	3,919	4,856
Amortization and impairment of deferred professional service costs	1,657	2,014
Non-cash operating lease expense	2,631	2,580
Accretion and amortization of marketable securities	2	(213)
Changes in operating assets and liabilities:
Accounts receivable and other, net	(1,778)	(5,795)
Deferred commissions	(920)	(2,670)
Deferred professional service costs	(629)	(901)
Prepaid expenses and other assets	(824)	(1,864)
Accounts payable	(10,201)	1,864
Operating lease liabilities	(2,616)	(2,795)
Accrued expenses and other liabilities	(1,511)	(3,131)
Deferred revenue	2,762	312
Accrued compensation	(3,114)	(806)
Net cash used in operating activities	(11,262)	(13,948)
Investing activities:
Purchase of property and equipment	(3,299)	(593)
Purchase of marketable securities	(2,994)	(13,780)
Sales of marketable securities	2,001	0
Maturities of marketable securities	17,400	11,453
Net cash provided by (used in) investing activities	13,108	(2,920)
Financing activities:
Proceeds from exercise of stock options	155	1,845
Proceeds from ESPP offering	186	0
Principal payments on long-term debt	(930)	(930)
Net cash (used in) provided by financing activities	(589)	915
Net increase (decrease) in cash, cash equivalents and restricted cash	1,257	(15,953)
Cash, cash equivalents and restricted cash at beginning of period	44,342	67,330
Cash, cash equivalents and restricted cash at end of period	45,599	51,377
Reconciliation of cash, cash equivalents and restricted cash:
Total cash, cash equivalents and restricted cash	$ 45,599	$ 51,377