Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of fair value of financial assets and liabilities measured at fair value and classification by level of input

The following tables summarize the fair value of financial assets that are measured at fair value and the classification by level of input within the fair value hierarchy:

	Fair Value Measurements as of
	June 30, 2019
(in thousands)	Level 1		Level 2		Level 3		Total
Investments:
Money market funds	$	71	$	—	$	—	$	71
Total assets measured at fair value	$	71	$	—	$	—	$	71

	Fair Value Measurements as of
	December 31, 2018
(in thousands)	Level 1		Level 2		Level 3		Total
Investments:
Money market funds	$	71	$	—	$	—	$	71
Total assets measured at fair value	$	71	$	—	$	—	$	71