Investments (Tables)

6 Months Ended

Jun. 30, 2019

Investments, Debt and Equity Securities [Abstract]

Summary of amortized cost and gross unrealized losses on all securities

The following table presents the amortized cost and gross unrealized losses on all securities at June 30, 2019:

	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	(in thousands)
Short-term investments:
U.S. Treasury securities	$	14,522	$	2	$			$	14,524
Common stock		1,059		29		(134	)	$	954
Total short-term investments	$	15,581	$	31	$	(134	)	$	15,478

The following table presents the amortized cost and gross unrealized losses on all securities at December 31, 2018:

	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	(in thousands)
Short-term investments:
U.S. Treasury securities	$	14,357		—		(1	)		14,356
Total short-term investments	$	14,357	$	—	$	(1	)	$	14,356

Summary of financial assets measured at fair value on a recurring basis

The following table summarizes the Company's financial assets measured at fair value on a recurring basis as of June 30, 2019:

	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash equivalents:
Money market funds	$	3,873	$	—	$	—	$	3,873
Investments:
Available-for-sale securities — current:
U.S. Treasury securities		—		14,524		—		14,524
Common stock		954		—		—		954
Total	$	4,827	$	14,524	$	—	$	19,351

The following table summarizes the Company's financial assets measured at fair value on a recurring basis as of December 31, 2018:

	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash equivalents:
Money market funds	$	2,821	$	—	$	—	$	2,821
Investments:
Available-for-sale securities — current:
U.S. Treasury securities		—		14,356		—		14,356
Total	$	2,821	$	14,356	$	—	$	17,177