Revenue (Tables)

12 Months Ended

Dec. 31, 2018

Revenue Recognition [Abstract]

Disaggregated Revenue

The following table depicts the disaggregation of revenue according to categories consistent with how the Company evaluates its financial performance:

	Year Ended December 31,
	2018		2017		2016
Total Online	$	121,333	$	108,388	$	101,827
Total Online by Geographic Area:
North America:
North America IT Deal Alert	$	43,342	$	36,622	$	25,743
North America Core Online		39,318		36,586		43,296
Total North America Online		82,660		73,208		69,039
International:
International IT Deal Alert		15,707		12,907		5,661
International Core Online		22,966		22,273		27,127
Total International Online		38,673		35,180		32,788
Total Online by Product:
IT Deal Alert:
North America IT Deal Alert		43,342		36,622		25,743
International IT Deal Alert		15,707		12,907		5,661
Total IT Deal Alert		59,049		49,529		31,404
Core Online:
North America Core Online		39,318		36,586		43,296
International Core Online		22,966		22,273		27,127
Total Core Online		62,284		58,859		70,423
Total Events		—		168		4,798
Total Revenues	$	121,333	$	108,556	$	106,625

Schedule of Accounts Receivable and Contract Liabilities

	Accounts Receivable
Year-to-Date Activity	(in thousands)
Balance Accounts Receivable December 31,2017 prior to adoption of ASC 606	$	29,601
Adjustment to accounts receivable as a result of adoption of ASC 606		3,510
Balance at January 1, 2018	$	26,091
	Contract Liabilities
Year-to-Date Activity	(in thousands)
Balance Deferred Revenue December 31,2017 prior to adoption of ASC 606	$	7,598
Adjustment to deferred revenue as a result of adoption of ASC 606		3,510
Balance at January 1, 2018		4,088
Deferral of revenue		5,573
Recognition of previously unearned revenue		4,088
Balance at December 31,2018	$	5,573