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Selected Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Information
 
Three Months Ended
 
March 31
 
June 30
 
September 30
 
December 31
 
(In thousands, except per share data)
2015:
 
 
 
 
 
 
 
General and administrative expense
$
4,880

 
$
4,754

 
$
3,962

 
$
3,958

Operating loss
(4,880
)
 
(4,754
)
 
(3,962
)
 
(3,958
)
Other income (loss), net
(388
)
 
(15
)
 
704

 
(84
)
Interest income
449

 
640

 
398

 
448

Interest expense
(1,122
)
 
(1,128
)
 
(1,133
)
 
(1,140
)
Equity loss
(8,662
)
 
(13,765
)
 
(7,635
)
 
(9,537
)
Net loss before income taxes
(14,603
)
 
(19,022
)
 
(11,628
)
 
(14,271
)
Income tax benefit (expense)
—

 
—

 
—

 
—

Net loss
$
(14,603
)
 
$
(19,022
)
 
$
(11,628
)
 
$
(14,271
)
Net loss per share (a)
 
 
 
 
 
 

Basic
$
(0.70
)
 
$
(0.91
)
 
$
(0.56
)
 
$
(0.69
)
Diluted
$
(0.70
)
 
$
(0.91
)
 
$
(0.56
)
 
$
(0.69
)
2014:
 
 
 
 
 
 
 
General and administrative expense
$
5,239

 
$
5,069

 
$
4,177

 
$
4,485

Operating loss
(5,239
)
 
(5,069
)
 
(4,177
)
 
(4,485
)
Other income (loss), net
30,374

 
1,452

 
(246
)
 
77

Interest income
470

 
542

 
482

 
407

Interest expense
(1,094
)
 
(1,098
)
 
(1,103
)
 
(1,107
)
Equity income (loss)
6,808

 
(3,175
)
 
(8,962
)
 
(10,006
)
Net income (loss) before income taxes
31,319

 
(7,348
)
 
(14,006
)
 
(15,114
)
Income tax benefit (expense)
—

 
—

 
—

 
—

Net income (loss)
$
31,319

 
$
(7,348
)
 
$
(14,006
)
 
$
(15,114
)
Net income (loss) per share (a)
 
 
 
 
 
 

Basic
$
1.44

 
$
(0.35
)
 
$
(0.68
)
 
$
(0.73
)
Diluted
$
1.29

 
$
(0.35
)
 
$
(0.68
)
 
$
(0.73
)
 
(a)
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.