Business Segment, Geographic, and Concentration Risk Information - Summary of Depreciation, Amortization and Assets by Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Total depreciation and amortization:
Total consolidated depreciation and amortization	$ 909	$ 921	$ 2,424	$ 2,585
Total assets:
Total consolidated assets	244,467		244,467		$ 140,413
Oncology Innovation Platform
Total depreciation and amortization:
Total consolidated depreciation and amortization	174	130	505	342
Total assets:
Total consolidated assets	164,480		164,480		65,966
Global Supply Chain Platform
Total depreciation and amortization:
Total consolidated depreciation and amortization	490	548	1,185	1,569
Total assets:
Total consolidated assets	51,327		51,327		51,128
Commercial Platform
Total depreciation and amortization:
Total consolidated depreciation and amortization	245	$ 243	734	$ 674
Total assets:
Total consolidated assets	$ 28,660		$ 28,660		$ 23,319