Summary of Significant Accounting Policies and Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Summary of Inventory

At December 31, 2017 and 2016, inventory consisted of the following (in thousands):

	December 31,
	2017		2016
Raw materials	$	8,963	$	8,293
Work-in-process		4,208		2,145
Total inventory	$	13,171	$	10,438

Summary of Estimated Useful Lives

Maintenance and repairs are expensed as incurred. The following estimated useful lives are used to depreciate the Company’s assets:

	Estimated Useful Life
Computer equipment and software	3 years
Lab equipment	3 years
Furniture and fixtures	5 years
Leasehold improvements	Shorter of the useful life or remaining lease term