Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2018

Revenue From Contract With Customer [Abstract]

Summary of Changes in Deferred Revenue Balance for Product and Service Revenue

A summary of changes in deferred revenue balances for product and service revenue is as follows:

	Product Revenue			Service Revenue			Total
Opening Balance - December 31, 2017	$	5,888		$	253		$	6,141
Additions		191			335			526
Recognized into Revenue		(150	)		(179	)		(329	)
Recognized into Accumulated Deficit		(5,703	)		—			(5,703	)
Ending Balance - March 31, 2018	$	226		$	409		$	635