Fair-Value Measurements

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair-Value Measurements

Fair-Value Measurements

As of March 31, 2018 and December 31, 2017, all investments were classified as short-term and available-for-sale on the accompanying Condensed Consolidated Balance Sheets. Investment income, which was included as a component of other income, consists of interest earned.

On a recurring basis, we measure certain financial assets at fair value. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability, an exit price, in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting standard establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs, where available. The following summarizes the three levels of inputs required:

Level 1—Observable inputs for identical assets or liabilities, such as quoted prices in active markets;

Level 2—Inputs other than quoted prices in active markets that are either directly or indirectly observable; and

Level 3—Unobservable inputs in which little or no market data exists, therefore they are developed using estimates and assumptions developed by us, which reflect those that a market participant would use.

Our fair value hierarchy for our financial assets and liabilities measured at fair value on a recurring basis are as follows:

	March 31, 2018
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Money-market funds classified as non-current restricted cash and investments	$	5,835	$	—	$	—	$	5,835
Money-market funds classified as short-term investments	71,625		—		—		71,625
Total	$	77,460	$	—	$	—	$	77,460

	December 31, 2017
	Level 1		Level 2		Level 3		Total
	(In thousands)
Assets:
Money-market funds classified as non-current restricted cash and investments	$	5,835	$	—	$	—	$	5,835
Money-market funds classified as short-term investments	80,355		—		—		80,355
Total	$	86,190	$	—	$	—	$	86,190

Cash held in demand deposit accounts of $1.2 million and $3.4 million is excluded from our fair-value hierarchy disclosure as of March 31, 2018 and December 31, 2017, respectively. There were no unrealized gains or losses associated with our short-term investments as of March 31, 2018 or December 31, 2017. The carrying amounts reported in the accompanying Condensed Consolidated Balance Sheets for receivables, accounts payable, other current monetary assets and liabilities and notes payable and lease financing obligations approximate fair value.