Prepaid Expenses and Other Current Assets

6 Months Ended

Jun. 30, 2019

Prepaid Expense And Other Assets Current [Abstract]

Prepaid Expenses and Other Current Assets

4. PREPAID EXPENSES AND OTHER CURRENT ASSETS

Prepaids and other current assets consisted of the following as of December 31, 2018 and June 30, 2019:

	December 31, 2018		June 30, 2019
	(in thousands)
Prepaid inventory	$	2,284	$	1,577
Restricted cash		550		307
Prepaid Insurance		434		2,987
Deferred offering costs		1,218		—
Other		932		880
Prepaid and other current assets	$	5,418	$	5,751