Revenue from Contracts with Customers (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table summarizes revenue by revenue source and reportable segment as follows:

	Three Months Ended June 30, 2018						Six Months Ended June 30, 2018
Major Products/Service Lines (in thousands)	U.S.		International		Total		U.S.		International		Total
Product revenue, net(1)	$	74,086	$	10,918	$	85,004	$	145,574	$	21,498	$	167,072
License and royalty revenues	—		569		569		—		1,131		1,131
Total revenues	$	74,086	$	11,487	$	85,573	$	145,574	$	22,629	$	168,203

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(1) The Company’s principal products include DEFINITY, TechneLite and Xenon and are categorized within product revenue, net. The Company applies the

same revenue recognition policies and judgments for all of its principal products.

Contract Liabilities

The following table summarizes activity for reserves relating to rebate and allowances (including group purchasing organization administrative fees and returns) for the six months ended June 30, 2018:

(in thousands)	Rebates and Allowances
Balance, January 1, 2018	$	2,860
Provision related to current period revenues	6,550
Adjustments relating to prior period revenues	(260		)
Payments or credits made during the period	(5,245		)
Balance, June 30, 2018	$	3,905

The Company recognized certain revenues as follows:

(in thousands)	Three Months Ended June 30, 2018		Six Months Ended June 30, 2018
Amounts included in the contract liability at the beginning of the period	$	9	$	17
Performance obligations satisfied (or partially satisfied) in previous periods	$	—	$	—