Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

Minimum annual rental commitments, net of guaranteed sublease income, for operating leases having initial or remaining noncancellable lease terms in excess of one year are as follows (in thousands): 

Years ending December 31,
2019	$	599
2020	89
Total minimum lease payments	$	688

Net assets of IP Fund [Table Text Block]