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Investments and Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2012
Investments and Fair Value Measurements [Abstract]  
Cash, cash equivalents and investments
Our cash, cash equivalents and investments are classified as follows (in thousands):

June 30, 2012
December 31, 2011
Gross
Gross
Gross
Gross
Amortized
Unrealized
Unrealized
Fair
Amortized
Unrealized
Unrealized
Fair
Cost
Gain
(Loss)
Value
Cost
Gain
(Loss)
Value
Classified as:
Cash
$
31,275
$
-
$
-
$
31,275
$
25,299
$
-
$
-
$
25,299
Cash equivalents:
Money market fund
6
-
-
6
857
-
-
857
Total cash equivalents
6
-
-
6
857
-
-
857
Total cash and cash equivalents
31,281
-
-
31,281
26,156
-
-
26,156
Investments (Available for sale):
Certificates of deposit
6,399
5
(7
)
6,397
3,561
5
(3
)
3,563
US Treasury and agency securities
1,200
-
-
1,200
1,200
-
(1
)
1,199
Corporate bonds
8,216
9
(35
)
8,190
9,859
2
(137
)
9,724
Total investments
15,815
14
(42
)
15,787
14,620
7
(141
)
14,486
Total cash, cash equivalents and investments
$
47,096
$           14
$
(42
)
$
47,068
$
40,776
$
7
$
(141
)
$
40,642
Contractual maturities on investments:
Due within 1 year
$
11,494
$
11,465
$
5,521
$
5,505
Due after 1 through 5 years
4,321
4,322
9,099
8,981
$
15,815
$
15,787
$
14,620
$
14,486
Fair value and gross unrealized losses related to available-for-sale securities
The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of June 30, 2012 (in thousands):

   
In Loss Position
< 12 months
 
In Loss Position
> 12 months
 
Total In
Loss Position
 
       
Gross
     
Gross
     
Gross
 
   
Fair
 
Unrealized
 
Fair
 
Unrealized
 
Fair
 
Unrealized
 
   
Value
 
(Loss)
 
Value
 
(Loss)
 
Value
 
(Loss)
 
Investments:
                         
Certificates of Deposit
 
$
3,752
 
$
(7
)
$
-
 
$
-
 
$
3,752
 
$
(7
)
Corporate bonds
 
-
 
-
 
5,074
 
(35
)
5,074
 
(35
)
Total in loss position
 
$
3,752
 
$
(7
)
$
5,074
 
$
(35
)
$
8,826
 
$
(42
)
Summary of financial assets and liabilities measured at fair value on a recurring basis
The following table summarizes our financial assets and liabilities measured at fair value on a recurring basis in accordance with ASC 820 as of June 30, 2012 (in thousands):

   
Balance as of
June 30, 2012
 
Quoted Prices in
Active Markets of
Identical Assets
(Level 1)
 
Significant Other
Observable
Inputs
(Level 2)
 
Assets:
             
Cash equivalents and investments:
             
Money market fund
 
$
6
 
$
6
 
$
-
 
Certificates of deposit
   
6,397
 
-
 
6,397
 
US Treasury and agency securities
   
1,200
 
-
 
1,200
 
Corporate bonds
 
8,190
 
-
 
8,190
 
Total
 
$
15,793
 
$
6
 
$
15,787
 
Liabilities
 
$
-
 
$
-
 
$
-