CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Jun. 30, 2014
ASSETS
Cash and cash equivalents	$ 111,827	$ 142,261
Accounts receivable	754us-gaap_AccountsReceivableGrossCurrent	1,896us-gaap_AccountsReceivableGrossCurrent
Unbilled revenue	536us-gaap_UnbilledContractsReceivable	1,329us-gaap_UnbilledContractsReceivable
Inventory	2,702us-gaap_InventoryNet	2,950us-gaap_InventoryNet
Prepaid and other current assets	3,309	2,320
Total current assets	119,128us-gaap_AssetsCurrent	150,756us-gaap_AssetsCurrent
Property and equipment, net of accumulated depreciation	14,631us-gaap_PropertyPlantAndEquipmentNet	14,349us-gaap_PropertyPlantAndEquipmentNet
Other assets	43us-gaap_OtherAssetsNoncurrent	213us-gaap_OtherAssetsNoncurrent
Total assets	133,802us-gaap_Assets	165,318us-gaap_Assets
LIABILITIES AND SHAREHOLDERS' EQUITY
Accounts payable	6,322us-gaap_AccountsPayableCurrent	4,819us-gaap_AccountsPayableCurrent
Accrued compensation	7,171	6,865
Other accrued liabilities	7,693us-gaap_OtherAccruedLiabilitiesCurrent	6,668us-gaap_OtherAccruedLiabilitiesCurrent
Current portion of deferred lease incentive	646imgn_IncentiveFromLessorCurrent	528imgn_IncentiveFromLessorCurrent
Current portion of deferred revenue	980us-gaap_DeferredRevenueCurrent	2,374us-gaap_DeferredRevenueCurrent
Total current liabilities	22,812us-gaap_LiabilitiesCurrent	21,254us-gaap_LiabilitiesCurrent
Deferred lease incentive, net of current portion	6,462imgn_IncentiveFromLessorNoncurrent	5,679imgn_IncentiveFromLessorNoncurrent
Deferred revenue, net of current portion	40,917us-gaap_DeferredRevenueNoncurrent	58,969us-gaap_DeferredRevenueNoncurrent
Other long-term liabilities	3,941us-gaap_OtherLiabilitiesNoncurrent	3,717us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	74,132us-gaap_Liabilities	89,619us-gaap_Liabilities
Commitments and contingencies (Note E)
Shareholders' equity:
Preferred stock, $0.01 par value; authorized 5,000 shares; no shares issued and outstanding
Common stock, $0.01 par value; authorized 150,000 shares; issued and outstanding 86,134 and 85,903 shares as of March 31, 2015 and June 30, 2014, respectively	861us-gaap_CommonStockValue	859us-gaap_CommonStockValue
Additional paid-in capital	737,205	722,971
Accumulated deficit	(678,396)	(648,131)
Total shareholders' equity	59,670us-gaap_StockholdersEquity	75,699us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	$ 133,802	$ 165,318

This item represents the current portion of the deferred credit for an incentive or inducement received by a lessee from a lessor, in order to motivate the lessee to enter the lease agreement, which incentive or inducement is to be recognized as a reduction of rental expense over the lease term.

No definition available.