Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Company's Available-for-Sale Securities by Level within Fair Value Hierarchy

The Company’s available-for-sale securities by level within the fair value hierarchy were as follows (in thousands):

As of June 30, 2019	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market fund	$	8,141	$	—	$	—	$	8,141
Short-term investments:
Corporate debt securities	—		73,292		—		73,292
U.S. government-related debt securities	—		27,380		—		27,380
Asset-backed securities	—		11,437		—		11,437
Total	$	8,141	$	112,109	$	—	$	120,250
As of December 31, 2018	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market fund	$	16,293	$	—	$	—	$	16,293
Short-term investments:
Corporate debt securities	—		47,279		—		47,279
U.S. government-related debt securities	—		14,961		—		14,961
Asset-backed securities	—		7,401		—		7,401
Total	$	16,293	$	69,641	$	—	$	85,934