Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

The following table presents the Company’s revenues disaggregated by component (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Acquisition underwriting revenue	$	1,432	$	4,359	$	4,633	$	11,272
Resale licensing revenue	10,257		18,878		26,073		32,073
Total seismic revenue	11,689		23,237		30,706		43,345
Solutions and other	635		463		1,107		950
Total revenue	$	12,324	$	23,700	$	31,813	$	44,295

Revenue Recognized From Non-Monetary Exchanges

The activity related to non-monetary exchanges was as follows (in thousands):



	Three Months Ended June 30,				Six Months Ended June 30,
	2018		2017		2018		2017
Seismic data library additions	$	—	$	1,000	$	—	$	1,250
Revenue recognized on specific data licenses or selections of data	63		1,000		63		1,250
Revenue recognized related to acquisition contracts	—		87		—		126
Revenue recognized related to Solutions and other revenue	29		31		34		31

Deferred Revenue Balance, Recognized By Year

The deferred revenue balance as of June 30, 2018 is scheduled to be recognized no later than the following, based on the contractual expiration of the selection period or the Company’s estimate of progress on acquisition projects and the availability of data products, although some revenue may be recognized earlier (in thousands):



2018	$	13,089
2019	155
2020 and thereafter	1,942