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Summary of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2017
Summary of Significant Accounting Policies [Abstract]  
Schedule of Deferred Revenue
Activity under the August 2013 Contract Settlement was as follows:
 
Deferred Revenue, December 31, 2016
 
$
4,000
 
Less: Amount amortized as revenue
  
375
 
Deferred Revenue, March 31, 2017
 
$
3,625
 
Cash and Available-for-Sale Securities Adjusted Cost, Gross Unrealized Gains, Gross Unrealized Losses and Fair Value by Significant Investment Category
The following tables show the adjusted cost, gross unrealized gains, gross unrealized losses and fair value of our securities by significant investment category as of March 31, 2017 and December 31, 2016.

  
March 31, 2017
 
  
Adjusted
Cost
  
Unrealized
Gains
  
Unrealized
Losses
  
Fair Value
  
Cash and Cash
Equivalents
  
Investments
Available for
Sale
 
Cash
 
$
1,947
  
$
—
  
$
—
  
$
1,947
  
$
1,947
  
$
—
 
                         
Level 1:
                        
Mutual funds
  
1,662
   
—
   
—
   
1,662
   
1,662
   
—
 
U.S. agency securities
  
6,133
   
—
   
(4
)
  
6,129
   
—
   
6,129
 
   
7,795
   
—
   
(4
)
  
7,791
   
1,662
   
6,129
 
Total
 
$
9,742
  
$
—
  
$
(4
)
 
$
9,738
  
$
3,609
  
$
6,129
 

  
December 31, 2016
 
  
Adjusted
Cost
  
Unrealized
Gains
  
Unrealized
Losses
  
Fair
Value
  
Cash
and Cash
Equivalents
  
Investments
Available
for Sale
 
Cash
 
$
3,432
  
$
—
  
$
—
  
$
3,432
  
$
3,432
  
$
—
 
                         
Level 1:
                        
Mutual funds
  
3,195
   
—
   
—
   
3,195
   
3,195
   
—
 
U.S. government securities
  
1,254
   
—
   
—
   
1,254
   
—
   
1,254
 
U.S. agency securities
  
7,996
   
2
   
(3
)
  
7,995
   
—
   
7,995
 
   
12,445
   
2
   
(3
)
  
12,444
   
3,195
   
9,249
 
Total
 
$
15,877
  
$
2
  
$
(3
)
 
$
15,876
  
$
6,627
  
$
9,249