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Investments (Tables)

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Short-Term and Long-Term Investments Available-for-Sale and Cost Method Investments

The fair value of investments classified as short-term consists of the following:

		March 31, 2019				December 31, 2018
Available-for-sale investments:
Time deposits and certificates of deposit		$	101			$	102
Bankers’ acceptance drafts			1,722				989
Asset-backed securities			—				9,113
Commercial paper			33,509				19,359
Corporate obligations			8,994				9,352
U.S. treasury obligations			—				13,298
U.S. agency obligations			—				21,613
		$	44,326			$	73,826

Investments classified as long-term consist of the following:

		March 31, 2019				December 31, 2018
Available-for-sale investments:
Group insurance contracts		$	5,950			$	5,890
Cost method investments:
Minority interest in a private company			4,400				4,400
		$	10,350			$	10,290

Gross Unrealized Gains and (Losses) Aggregated by Investment Category

The following tables show the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:

As of March 31, 2019:		Cost				Gross Unrealized Gains				Gross Unrealized (Losses)				Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit		$	99			$	2			$	—			$	101
Bankers’ acceptance drafts			1,722				—				—				1,722
Commercial paper			33,752				1				(244	)			33,509
Corporate obligations			8,996				1				(3	)			8,994
		$	44,569			$	4			$	(247	)		$	44,326
As of March 31, 2019:		Cost				Gross Unrealized Gains				Gross Unrealized (Losses)				Estimated Fair Value
Long-term investments:
Available-for-sale investments:
Group insurance contracts		$	5,582			$	368			$	—			$	5,950
As of December 31, 2018:		Cost				Gross Unrealized Gains				Gross Unrealized (Losses)				Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit		$	102			$	—			$	—			$	102
Bankers’ acceptance drafts			989				—				—				989
Asset-backed securities			9,121				1				(9	)			9,113
Commercial paper			19,504				—				(145	)			19,359
Corporate obligations			9,367				—				(15	)			9,352
U.S. treasury obligations			13,294				4				—				13,298
U.S. agency obligations			21,617				2				(6	)			21,613
		$	73,994			$	7			$	(175	)		$	73,826

As of December 31, 2018:		Cost				Gross Unrealized Gains				Gross Unrealized (Losses)				Estimated Fair Value
Long-term investments:
Available-for-sale investments:
Group insurance contracts		$	5,546			$	344			$	—			$	5,890

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- Definition

Investments classified as short-term and long-term available-for-sale investments and long-term cost method investments.

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- Definition

Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value.

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