Prepaid Expenses and Other Current Assets

3 Months Ended

Mar. 31, 2019

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Prepaid Expenses and Other Current Assets

4. Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	March 31, 2019		December 31, 2018
Prepaid research and development services	$	743	$	245
Prepaid insurance		92		200
Other prepaid expenses		68		20
NOL sale receivable		—		6,732
Other current assets		55		54
Total prepaid expenses and other current assets	$	958	$	7,251