Long Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Long Lived Assets	$ 104,760	$ 42,985
United States
Segment Reporting, Asset Reconciling Item [Line Items]
Long Lived Assets	77,039	36,350
Sweden
Segment Reporting, Asset Reconciling Item [Line Items]
Long Lived Assets	5,180	$ 6,635
Germany
Segment Reporting, Asset Reconciling Item [Line Items]
Long Lived Assets	$ 22,541