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Investments
9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Investments
NOTE 6. INVESTMENTS

The following tables summarize the Company’s available-for-sale investments at September 30, 2018 and December 31, 2017 (in thousands):

 
September 30, 2018
 
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
Certificates of deposit
$
12,481

$

$

$
12,481

U.S. Treasury securities
34,390


(122
)
34,268

U.S. Agency securities
8,017


(66
)
7,951

Commercial paper
18,456



18,456

Asset-backed securities
11,968


(1
)
11,967

Corporate notes and bonds
33,916

2

(59
)
33,859

Total
$
119,228

$
2

$
(248
)
$
118,982


 
December 31, 2017
 
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
Certificates of deposit
$
13,441

$

$

$
13,441

U.S. Treasury securities
14,787


(71
)
14,716

U.S. Agency securities
8,510


(51
)
8,459

Commercial paper
9,171



9,171

Asset-backed securities
3,026


(1
)
3,025

Corporate notes and bonds
31,906


(70
)
31,836

Total
$
80,841

$

$
(193
)
$
80,648



The following table summarizes the maturities of the Company’s available-for-sale securities at September 30, 2018 and December 31, 2017 (in thousands):

 
September 30, 2018
December 31, 2017
 
Amortized
Cost
Fair Value
Amortized
Cost
Fair Value
Due in less than 1 year
$
93,971

$
93,825

$
55,801

$
55,735

Due in 1-3 years
25,257

25,157

25,040

24,913

Total
$
119,228

$
118,982

$
80,841

$
80,648



Proceeds from sales of marketable securities (including principal paydowns), for the three months ended September 30, 2018 and 2017 were $0 and $3.0 million, respectively, and for the nine months ended September 30, 2018 and 2017 were $3.0 million and $9.5 million, respectively. The Company determines gains and losses of marketable securities based on specific identification of the securities sold. There were no realized gains from sales of marketable securities for the three and nine months September 30, 2018 and 2017. No balances were reclassified out of accumulated other comprehensive income (loss) for the three and nine months September 30, 2018 and 2017.

The Company monitors investments for other-than-temporary impairment. It was determined that unrealized gains and losses as of September 30, 2018 and December 31, 2017 are temporary in nature because the change in market value for those securities has resulted from fluctuating interest rates rather than a deterioration of the credit worthiness of the issuers. The Company does not intend to sell investments and it is more likely than not that we will not be required to sell investments before recovering the amortized cost.