Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Depreciation is recorded using the straight-line method over the estimated useful lives of the assets as follows:



Machinery, manufacturing and demonstration equipment	3-5 years
Computer equipment	3 years
Furniture	5 years
Leasehold improvements	Lesser of lease term or 3 to 10 years

The following table presents revenue disaggregated by type and geography:



	Three Months Ended				Six Months Ended
	2019		2018		2019		2018
	(in thousands) (unaudited)
U.S.
Systems	$	—	$	875	$	—	$	875
Instruments and accessories	25		409		25		409
Services	127		28		260		49
Total U.S. revenue	152		1,312		285		1,333
Outside of U.S. ("OUS")
Systems	2,737		3,782		4,024		7,236
Instruments and accessories	535		1,101		1,081		2,212
Services	215		194		430		375
Total OUS revenue	3,487		5,077		5,535		9,823
Total
Systems	2,737		4,657		4,024		8,111
Instruments and accessories	560		1,510		1,106		2,621
Services	342		222		690		424
Total revenue	$	3,639	$	6,389	$	5,820	$	11,156

The details of this adjustment are summarized below.



	Balance at December 31, 2018		Adjustments Due to ASC 842		Balance at January 1, 2019
	(unaudited) (In thousands)
Assets
Other long term assets	$	—	$	1,751	$	1,751
Liabilities and Stockholders' Equity
Accrued expenses	—		507		507
Other long term liabilities	$	—	$	1,244	$	1,244

The following table presents the minimum lease payments as of June 30, 2019 (in thousands):



July 1, 2019 to December 31, 2019	662
January 1, 2020 to December 31, 2020	1,317
January 1, 2021 to December 31, 2021	669
January 1, 2022 to December 31, 2022	404
January 1, 2023 to December 31, 2023	194
January 1, 2024 to December 31, 2024	33
Thereafter	—
Total minimum lease payments	3,279
Less: Amount of lease payments representing interest	(352	)
Present value of future minimum lease payments	2,927