Short-Term Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2017

Investments Debt And Equity Securities [Abstract]

Summary of Short-Term Marketable Securities

The following is a summary of short-term marketable securities classified as available-for-sale (in thousands):

December 31, 2017	Amortized Cost		Unrealized Gain		Unrealized Loss		Market Value
U.S. treasuries	$	34,462	$	—	$	29	$	34,433
Certificates of deposit		1,225		—		—		1,225
	$	35,687	$	—	$	29	$	35,658

December 31, 2016	Amortized Cost		Unrealized Gain		Unrealized Loss		Market Value
U.S. treasuries	$	23,295	$	—	$	18	$	23,277
Certificates of deposit		7,275		—		—		7,275
	$	30,570	$	—	$	18	$	30,552

- 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.

+ References + Details