CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue:
Total revenue, net		$ 35,078	$ 35,461	$ 109,623	$ 106,861
Cost of revenue:
Total cost of revenue		11,887	14,501	39,121	42,774
Gross profit		23,191	20,960	70,502	64,087
Operating expenses:
Sales and marketing	[1]	6,158	9,829	24,313	27,933
Research and development	[1]	11,182	14,295	38,047	44,507
General and administrative	[1]	6,341	6,440	19,257	20,743
Goodwill impairment		0	0	50,300	0
Total operating expenses		23,681	30,564	131,917	93,183
Operating loss		(490)	(9,604)	(61,415)	(29,096)
Other income, net		43	268	429	840
Net loss		$ (447)	$ (9,336)	$ (60,986)	$ (28,256)
Net loss per share, basic and diluted (in usd per share)		$ 0	$ (0.06)	$ (0.41)	$ (0.20)
Weighted-average shares used to compute basic and diluted net loss per share (in shares)		152,146	145,701	150,372	144,434
Subscription
Revenue:
Total revenue, net		$ 34,069	$ 34,900	$ 106,741	$ 102,670
Cost of revenue:
Total cost of revenue	[1]	8,013	8,517	27,064	24,917
Professional services and other
Revenue:
Total revenue, net		1,009	561	2,882	4,191
Cost of revenue:
Total cost of revenue	[1]	$ 3,874	$ 5,984	$ 12,057	$ 17,857

[1] Includes stock-based compensation expense as follows:  Three Months Ended September 30,Nine Months Ended September 30, 2020201920202019Cost of revenue:Cost of subscription$224 $180 $598 $595 Cost of professional services and other171 236 431 737 Sales and marketing282 678 1,702 1,967 Research and development1,026 1,294 3,503 4,731 General and administrative1,401 625 3,325 3,817