Balance Sheet Detail (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Equipment and leasehold improvements
Gross	$ 3,302		$ 2,955
Less accumulated depreciation and amortization	(1,378)		(1,018)
Net	1,924		1,937
Depreciation and amortization expense	359	$ 192
Accounts payable and accrued expenses
Trade accounts payable	47,876		72,093
Accrued expenses	3,046		3,994
Accounts payable and accrued expenses	50,922		76,087
Equipment
Equipment and leasehold improvements
Gross	1,972		1,638
Leasehold improvements
Equipment and leasehold improvements
Gross	1,330		$ 1,317
General and Administrative Expense
Equipment and leasehold improvements
Depreciation and amortization expense	$ 400	$ 200