Cost Method Investment and Collaborative Arrangement (Tables)

6 Months Ended

Jun. 30, 2018

Investments, All Other Investments [Abstract]

Schedule Of Periodic Payments For Prepaid Royalties

As of June 30, 2018, expected future royalty prepayments are as follows:

Fiscal year	(in thousands)
2018 (remaining 6 months)	$	1,750
2019	$	5,000