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Investments and Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2013
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, 2013
  
December 31, 2012
 
 
 
  
Gross
  
Gross
  
  
  
Gross
  
Gross
  
 
 
 
Amortized
  
Unrealized
  
Unrealized
  
Fair
  
Amortized
  
Unrealized
  
Unrealized
  
Fair
 
 
 
Cost
  
Gains
  
(Losses)
  
Value
  
Cost
  
Gains
  
(Losses)
  
Value
 
Classified as:
 
  
  
  
  
  
  
  
 
Cash
 
$
21,957
  
$
—
  
$
—
  
$
21,957
  
$
26,250
  
$
—
  
$
—
  
$
26,250
 
Cash equivalents:
                                
Money market fund
  
2
   
—
   
—
   
2
   
4,384
   
—
   
—
   
4,384
 
 
                                
Total cash equivalents
  
2
   
—
   
—
   
2
   
4,384
   
—
   
—
   
4,384
 
 
                                
Total cash and cash equivalents
  
21,959
   
—
   
—
   
21,959
   
30,634
   
—
   
—
   
30,634
 
 
                                
Investments (Available-for-sale):
                                
Certificates of deposit
  
7,040
   
6
   
(10
)
  
7,036
   
6,638
   
9
   
(2
)
  
6,645
 
Corporate bonds
  
16,523
   
3
   
(95
)
  
16,431
   
12,872
   
7
   
(63
)
  
12,816
 
Total investments
  
23,563
   
9
   
(105
)
  
23,467
   
19,510
   
16
   
(65
)
  
19,461
 
Total cash, cash equivalents and investments
 
$
45,522
  
$
9
  
$
(105
)
 
$
45,426
  
$
50,144
  
$
16
  
$
(65
)
 
$
50,095
 
Contractual maturities on investments:
                                
Due within 1 year
 
$
6,578
          
$
6,581
  
$
10,288
          
$
10,270
 
Due after 1 through 5 years
  
16,985
           
16,886
   
9,222
           
9,191
 
 
 
$
23,563
          
$
23,467
  
$
19,510
          
$
19,461
 
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, 2013 (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
  
(Losses)
  
Value
  
(Losses)
  
Value
  
(Losses)
 
Investments:
 
  
  
  
  
  
 
Certificates of deposit
 
$
3,430
  
$
(10
)
 
$
—
  
$
—
  
$
3,430
  
$
(10
)
Corporate bonds
  
12,658
   
(95
)
  
—
   
—
   
12,658
   
(95
)
Total in loss position
 
$
16,088
  
$
(105
)
 
$
—
  
$
—
  
$
16,088
  
$
(105
)
 
 
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 December 31, 2012 (in thousands):

 
 
In Loss Position
< 12 Months
  
In Loss Position
> 12 Months
  
Total In
Loss Position
 
 
 
Fair
Value
  
Gross
Unrealized
(Losses)
  
Fair
Value
  
Gross
Unrealized
(Losses)
  
Fair
Value
  
Gross
Unrealized
(Losses)
 
Investments:
 
  
  
  
  
  
 
Certificates of deposit
 
$
1,877
  
$
(1
)
 
$
199
  
$
(1
)
 
$
2,076
  
$
(2
)
Corporate bonds
  
6,446
   
(40
)
  
1,502
   
(23
)
  
7,948
   
(63
)
Total in loss position
 
$
8,323
  
$
(41
)
 
$
1,701
  
$
(24
)
 
$
10,024
  
$
(65
)
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 as of June 30, 2013 (in thousands):

 
 
Balance as of
June 30, 2013
  
Quoted Prices in
Active Markets of
Identical Assets
(Level 1)
  
Significant Other
Observable
Inputs
(Level 2)
 
Assets:
 
  
  
 
Cash equivalents and investments:
 
  
  
 
Money market fund
 
$
2
  
$
2
  
$
—
 
Certificates of deposit
  
7,036
   
—
   
7,036
 
Corporate bonds
  
16,431
   
—
   
16,431
 
Total
 
$
23,469
  
$
2
  
$
23,467
 
Liabilities
 
$
—
  
$
—
  
$
—
 

The following table summarizes our financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2012 (in thousands):

 
 
Balance as of
December 31, 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
 
$
4,384
  
$
4,384
  
$
—
 
Certificates of deposit
  
6,645
   
—
   
6,645
 
Corporate bonds
  
12,816
   
—
   
12,816
 
Total
 
$
23,845
  
$
4,384
  
$
19,461
 
Liabilities
 
$
—
  
$
—
  
$
—