Investments and Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Investments And Fair Value Of Financial Instruments [Abstract]

Summary of Amortized Cost and Fair Value of the Available-For-Sale Investment Securities Portfolio

The following tables summarize the amortized cost and fair value of the available-for-sale investment securities portfolio at March 31, 2017 and December 31, 2016, and the corresponding amounts of unrealized gains and losses recognized in accumulated other comprehensive income (“AOCI”):


(Dollars in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
March 31, 2017
Cash equivalents:
Commercial paper		2,996		—		—			2,996
Money market funds		3,867		—		—			3,867
Short-term investments:
Certificates of Deposit		2,402		—		(1	)		2,401
Commercial paper		16,076		—		—			16,076
U.S. government securities		17,508		—		(13	)		17,495
U.S. government agency securities		5,000		—		(6	)		4,994
Total Assets at Fair Value	$	47,849	$	—	$	(20	)	$	47,829

(Dollars in thousands)	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
December 31, 2016
Cash equivalents:
Money market funds	$	1,549	$	—	$	—		$	1,549
Short-term investments:
Certificates of Deposit		3,049		—		(2	)		3,047
Commercial paper		21,248		—		—			21,248
U.S. government securities		19,267		—		(9	)		19,258
U.S. government agency securities		5,000		—		(6	)		4,994
Long-term investments:
U.S. government securities		2,500		—		(2	)		2,498
Total Assets at Fair Value	$	52,613	$	—	$	(19	)	$	52,594

Summary of Fair Value of Available-for-Sale Investments

The fair value of the available-for-sale investments at March 31, 2017 and December 31, 2016 were as follows:

	Fair Value Measurements at March 31, 2017
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets at Fair Value
Cash equivalents:
Commercial paper	$	—	$	2,996	$	—	$	2,996
Money market funds		3,867		—		—		3,867
Short-term investments:
Certificates of Deposit		—		2,402		—		2,402
Commercial paper		—		16,075		—		16,075
U.S. government securities		17,495		—		—		17,495
U.S. government agency securities		—		4,994		—		4,994
Total Assets at Fair Value	$	21,362	$	26,467	$	—	$	47,829

	Fair Value Measurements at December 31, 2016
(Dollars in thousands)	Level 1		Level 2		Level 3		Total
Assets at Fair Value
Cash equivalents:
Money market funds	$	1,549	$	—	$	—	$	1,549
Short-term investments:
Certificates of Deposit		—		3,047		—		3,047
Commercial paper		—		21,248		—		21,248
U.S. government securities		19,258		—		—		19,258
U.S. government agency securities		—		4,994		—		4,994
Long-term investments:
U.S. government securities		2,498		—		—		2,498
Total Assets at Fair Value	$	23,305	$	29,289	$	—	$	52,594

- 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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- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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