Investments (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Summary of amortized cost, and gross unrealized gains and losses on all securities

	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

The following table presents the amortized cost, and gross unrealized gains and losses on all securities at December 31, 2017:

	Amortized cost		Gross unrealized gains		Gross unrealized losses			Fair value
	(in thousands)
Short-term investments:
Commercial paper	$	4,994	$	—	$	(1	)	$	4,993
Corporate notes/bonds		1,458		—		—			1,458
Total short-term investments	$	6,452	$	—	$	(1	)	$	6,451

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

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

The following table summarizes the Company’s financial assets measured at fair value on a recurring basis as of December 31, 2017:

	Level 1		Level 2		Level 3		Total
	(in thousands)
Cash equivalents:
Money market funds	$	4,575	$	—	$	—	$	4,575
Investments:
Available-for-sales securities—current:
Commercial paper		—		4,993		—		4,993
Corporate notes/bonds		—		1,458		—		1,458
Total	$	4,575	$	6,451	$	—	$	11,026