Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2017

Investments All Other Investments [Abstract]

Cash Equivalents, Restricted Cash and Short-Term Investments Classified as Available-for-sale Securities

Cash equivalents, restricted cash and short-term investments, all of which are classified as available-for-sale securities, consisted of the following (in thousands):

March 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Money market funds	$	14,619	$	—	$	—	$	14,619
Restricted cash (money market funds)		12,860		—		—		12,860
Total financial assets	$	27,479	$	—	$	—	$	27,479
Classified as:
Cash and cash equivalents							$	14,619
Restricted cash (money market funds)								12,860
							$	27,479

December 31, 2016	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds	$	10,156	$	—	$	—		$	10,156
Restricted cash (money market funds)		19,593		—		—			19,593
Corporate notes		6,802		—		(2	)		6,800
Total financial assets	$	36,551	$	—	$	(2	)	$	36,549
Classified as:
Cash and cash equivalents								$	10,156
Restricted cash (money market funds)									19,593
Short-term investments									6,800
								$	36,549

- 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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