Property and Equipment (Details) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2016	Jan. 02, 2018
Property and Equipment
Property and equipment, gross		$ 52,395,000	$ 71,982,000
Less accumulated depreciation		(39,504,000)	(57,444,000)
Property and equipment, net		12,891,000	14,538,000		$ 14,538,000
Depreciation expense	$ 3,074,000	7,411,000	5,963,000	$ 5,327,000
Leasehold improvements
Property and Equipment
Property and equipment, gross		20,684,000	36,460,000
Machinery and equipment
Property and Equipment
Property and equipment, gross		22,558,000	23,123,000
Computer hardware and software
Property and Equipment
Property and equipment, gross		5,494,000	8,273,000
Furniture and fixtures
Property and Equipment
Property and equipment, gross		3,546,000	3,710,000
Assets under construction
Property and Equipment
Property and equipment, gross		113,000	416,000
Equipment under capital leases
Property and Equipment
Less accumulated depreciation		(684,000)	(479,000)
Property and equipment, net	$ 449,000	$ 595,000	$ 449,000