Details of Certain Condensed Consolidated Balance Sheet Accounts - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]
Prepaid expenses	$ 1,099	$ 832
Deferred commissions	682	629
Other	204	66
Total	$ 1,985	$ 1,527