Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Summary of Product Revenue by Geographical Locations of Customers

Product revenue by geographical locations of customers during the three months ended March 31, 2018 and 2017, were as follows (in thousands):

	Three Months Ended
	March 31,
	2018		2017
Product revenue:
North America	$	2,387	$	1,065
Europe, Middle East and Africa		11,006		5,911
Other		171		30
Total product revenue	$	13,564	$	7,006

Summary of Changes in Contract Liabilities

The changes in the contract liabilities during the three months ended March 31, 2018 and 2017, were as follows (in thousands):

	Beginning							Ending
Contract Liabilities	Balance		Additions		Deductions			Balance
Three months ended March 31, 2018
Deferred product revenue - current	$	445	$	662	$	(468	)	$	639
Deferred product revenue - non current		15		—		(8	)		7
Three months ended March 31, 2017
Deferred product revenue - current	$	149	$	634	$	(313	)	$	470
Deferred product revenue - non current		46		—		(8	)		38

Anti-Dilutive Effect of Common Shares

The table below presents shares underlying stock options, restricted stock units, and employee stock purchase plan rights that were excluded from the calculation of the weighted average number of shares outstanding used for the calculation of diluted net loss per share. These are excluded from the calculation due to their anti-dilutive effect for the three months ended March 31, 2018 and 2017 (shares in thousands):

	Three Months Ended
	March 31,
	2018		2017
Weighted average number of anti-dilutive potential shares:
Stock options		17,879		16,669
Restricted stock units		1,579		966
Employee stock purchase plan rights		92		—
Total		19,550		17,635