Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2018

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets as of December 31, 2018 and 2017 were comprised as follows (in thousands):

	December 31,
	2018		2017
Prepaid expenses	$	1,921	$	2,196
Taxes receivable	—		16,737
Interest receivable on investments	414		969
Other current assets	—		43
Total prepaid expenses and other current assets	$	2,335	$	19,945