Prepaid Expenses and Other Current Assets

9 Months Ended

Sep. 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 September 30, 2019:

	December 31, 2018		September 30, 2019
	(in thousands)
Prepaid inventory	$	2,284	$	2,329
Restricted cash		550		307
Prepaid insurance		434		2,904
Deferred offering costs		1,218		—
Other		932		1,196
Prepaid and other current assets	$	5,418	$	6,736