Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2017

Available-for-sale Securities [Table Text Block]

securities as of March 31, 2017 and December 31, 2016 consisted of the following:



March 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market mutual funds	$	14,233	$	—	$	—	$	14,233
Certificates of deposit	2,510		—		—		2,510
Total marketable securities designated as available-for-sale	$	16,743	$	—	$	—	$	16,743



December 31, 2016	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market mutual funds	$	21,848	$	—	$	—	$	21,848
Certificates of deposit	3,864		—		—		3,864
Total marketable securities designated as available-for-sale	$	25,712	$	—	$	—	$	25,712

Available-for-sale Securities, Debt Maturities, Amortized Cost And Fair Value Basis [Table Text Block]

The amortized costs and fair value of marketable securities as of March 31, 2017 and December 31, 2016 are shown below by effective maturity. Effective maturities may differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.



March 31, 2017	Amortized Cost		Fair Value
Due in less than one year	$	2,510	$	2,510
December 31, 2016	Amortized Cost		Fair Value
Due in less than one year	$	3,864	$	3,864

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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