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Balance Sheet Account Detail - Components of Inventories (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Inventory [Line Items]
Raw materials	$ 1,054,000	$ 1,507,000
Work-in-process	5,018,000	3,979,000
Finished goods	3,007,000	3,714,000
Inventories	9,079,000us-gaap_InventoryNet	9,200,000us-gaap_InventoryNet
ZEVALIN [Member]
Inventory [Line Items]
Work-in-process	800,000
Contractual commitment	$ 6,400,000

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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- Definition

Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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