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Selected Quarterly Financial Information (Unaudited) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]                      
General and administrative expense $ 4,485us-gaap_GeneralAndAdministrativeExpense $ 4,177us-gaap_GeneralAndAdministrativeExpense $ 5,069us-gaap_GeneralAndAdministrativeExpense $ 5,239us-gaap_GeneralAndAdministrativeExpense $ 4,720us-gaap_GeneralAndAdministrativeExpense $ 4,835us-gaap_GeneralAndAdministrativeExpense $ 6,715us-gaap_GeneralAndAdministrativeExpense $ 5,374us-gaap_GeneralAndAdministrativeExpense $ 18,970us-gaap_GeneralAndAdministrativeExpense $ 21,644us-gaap_GeneralAndAdministrativeExpense $ 19,473us-gaap_GeneralAndAdministrativeExpense
Operating loss (4,485)us-gaap_OperatingIncomeLoss (4,177)us-gaap_OperatingIncomeLoss (5,069)us-gaap_OperatingIncomeLoss (5,239)us-gaap_OperatingIncomeLoss (4,720)us-gaap_OperatingIncomeLoss (4,835)us-gaap_OperatingIncomeLoss (6,715)us-gaap_OperatingIncomeLoss (5,374)us-gaap_OperatingIncomeLoss (18,970)us-gaap_OperatingIncomeLoss (21,644)us-gaap_OperatingIncomeLoss (19,473)us-gaap_OperatingIncomeLoss
Other income (loss), net 77us-gaap_OtherNonoperatingIncomeExpense (246)us-gaap_OtherNonoperatingIncomeExpense 1,452us-gaap_OtherNonoperatingIncomeExpense 30,374us-gaap_OtherNonoperatingIncomeExpense 6,574us-gaap_OtherNonoperatingIncomeExpense (4,224)us-gaap_OtherNonoperatingIncomeExpense (2,724)us-gaap_OtherNonoperatingIncomeExpense 757us-gaap_OtherNonoperatingIncomeExpense 31,657us-gaap_OtherNonoperatingIncomeExpense 383us-gaap_OtherNonoperatingIncomeExpense 9,338us-gaap_OtherNonoperatingIncomeExpense
Interest income 407us-gaap_InvestmentIncomeInterest 482us-gaap_InvestmentIncomeInterest 542us-gaap_InvestmentIncomeInterest 470us-gaap_InvestmentIncomeInterest 550us-gaap_InvestmentIncomeInterest 572us-gaap_InvestmentIncomeInterest 790us-gaap_InvestmentIncomeInterest 734us-gaap_InvestmentIncomeInterest 1,901us-gaap_InvestmentIncomeInterest 2,646us-gaap_InvestmentIncomeInterest 2,926us-gaap_InvestmentIncomeInterest
Interest expense (1,107)us-gaap_InterestExpenseDebt (1,103)us-gaap_InterestExpenseDebt (1,098)us-gaap_InterestExpenseDebt (1,094)us-gaap_InterestExpenseDebt (1,083)us-gaap_InterestExpenseDebt (1,077)us-gaap_InterestExpenseDebt (1,074)us-gaap_InterestExpenseDebt (1,069)us-gaap_InterestExpenseDebt (4,402)us-gaap_InterestExpenseDebt (4,303)us-gaap_InterestExpenseDebt (5,636)us-gaap_InterestExpenseDebt
Equity loss (10,006)us-gaap_IncomeLossFromEquityMethodInvestments (8,962)us-gaap_IncomeLossFromEquityMethodInvestments (3,175)us-gaap_IncomeLossFromEquityMethodInvestments 6,808us-gaap_IncomeLossFromEquityMethodInvestments 22,646us-gaap_IncomeLossFromEquityMethodInvestments (9,866)us-gaap_IncomeLossFromEquityMethodInvestments (18,400)us-gaap_IncomeLossFromEquityMethodInvestments (6,987)us-gaap_IncomeLossFromEquityMethodInvestments (15,335)us-gaap_IncomeLossFromEquityMethodInvestments (12,607)us-gaap_IncomeLossFromEquityMethodInvestments (26,517)us-gaap_IncomeLossFromEquityMethodInvestments
Net loss before income taxes (15,114)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (14,006)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (7,348)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 31,319us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 23,967us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (19,430)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (28,123)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (11,939)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (5,149)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (35,525)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest (39,362)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax benefit (expense) 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit
Net loss $ (15,114)us-gaap_ProfitLoss $ (14,006)us-gaap_ProfitLoss $ (7,348)us-gaap_ProfitLoss $ 31,319us-gaap_ProfitLoss $ 23,967us-gaap_ProfitLoss $ (19,430)us-gaap_ProfitLoss $ (28,123)us-gaap_ProfitLoss $ (11,939)us-gaap_ProfitLoss $ (5,149)us-gaap_ProfitLoss $ (35,525)us-gaap_ProfitLoss $ (39,362)us-gaap_ProfitLoss
Net loss per share                      
Basic (in dollars per share) $ (0.73)us-gaap_EarningsPerShareBasic [1] $ (0.68)us-gaap_EarningsPerShareBasic [1] $ (0.35)us-gaap_EarningsPerShareBasic [1] $ 1.44us-gaap_EarningsPerShareBasic [1] $ 1.10us-gaap_EarningsPerShareBasic [1] $ (0.90)us-gaap_EarningsPerShareBasic [1] $ (1.33)us-gaap_EarningsPerShareBasic [1] $ (0.57)us-gaap_EarningsPerShareBasic [1] $ (0.25)us-gaap_EarningsPerShareBasic $ (1.66)us-gaap_EarningsPerShareBasic $ (1.88)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ (0.73)us-gaap_EarningsPerShareDiluted [1] $ (0.68)us-gaap_EarningsPerShareDiluted [1] $ (0.35)us-gaap_EarningsPerShareDiluted [1] $ 1.29us-gaap_EarningsPerShareDiluted [1] $ 0.99us-gaap_EarningsPerShareDiluted [1] $ (0.90)us-gaap_EarningsPerShareDiluted [1] $ (1.33)us-gaap_EarningsPerShareDiluted [1] $ (0.57)us-gaap_EarningsPerShareDiluted [1] $ (0.25)us-gaap_EarningsPerShareDiluted $ (1.66)us-gaap_EarningsPerShareDiluted $ (1.88)us-gaap_EarningsPerShareDiluted
[1] Per share amounts for the quarters have each been calculated separately. Accordingly, quarterly amounts may not add to the annual amounts because of differences in the average common shares outstanding during each period. Additionally, in regard to diluted per share amounts only, quarterly amounts may not add to the annual amounts because of the inclusion of the effect of potentially dilutive securities only in the periods in which such effect would have been dilutive, and because of the adjustments to net income (loss) for the dilutive effect of partner company common stock equivalents and convertible securities.