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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 26,406	$ 21,896
Expenses:
Service costs	$ 14,258	$ 12,823
Type of Cost, Good or Service [Extensible List]	us-gaap:ServiceMember	us-gaap:ServiceMember
Sales and marketing	$ 4,113	$ 3,610
Product development	4,568	3,648
General and administrative	3,320	2,970
Amortization of intangible assets from acquisitions	1,568
Acquisition-related costs	182
Total operating expenses	28,009	23,051
Loss from operations	(1,603)	(1,155)
Interest income and other, net	185	240
Loss before provision for income taxes	(1,418)	(915)
Income tax expense (benefit)	(119)	11
Net loss applicable to common stockholders	$ (1,299)	$ (926)
Basic and diluted net loss per Class A and Class B share applicable to common stockholders	$ (0.03)	$ (0.02)
Class A
Expenses:
Net loss applicable to common stockholders	$ (146)	$ (109)
Shares used to calculate basic net loss per share applicable to common stockholders:
Shares used to calculate basic net loss per share applicable to common stockholders	5,056	5,056
Shares used to calculate diluted net loss per share applicable to common stockholders:
Shares used to calculate diluted net loss per share applicable to common stockholders	5,056	5,056
Class B
Expenses:
Net loss applicable to common stockholders	$ (1,153)	$ (817)
Shares used to calculate basic net loss per share applicable to common stockholders:
Shares used to calculate basic net loss per share applicable to common stockholders	39,827	38,039
Shares used to calculate diluted net loss per share applicable to common stockholders:
Shares used to calculate diluted net loss per share applicable to common stockholders	44,883	43,095

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