Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Revenue and Accounts Receivable Concentration

The following table presents total revenue and accounts receivable concentration for the periods presented or as of the dates presented:

	Year Ended December 31,
	2020			2019			2018
Revenue:
Avery Dennison(1)		32	%		31	%		39	%
North American logistics provider	*				14		*
Arizon		10		*				10
		42	%		45	%		49	%
* Less than 10%
(1) Includes concentration of revenue related to Smartrac NV, or Smartrac. In March 2020, Avery Dennison completed an acquisition of Smartrac.

	As of December 31,
	2020			2019
Accounts Receivable:
Avery Dennison(1)		21	%		28	%
Arizon		17		*
Xindeco		12		*
Blue Star	*				18
		50	%		46	%
* Less than 10%
(1) Includes concentration of accounts receivable related to Smartrac.

Summary of Allowance for Sales Returns

The following table summarizes our allowance for sales returns (in thousands):

	Balance at Beginning of Year		Additional Reserve		Applied Sales Return			Balance at End of Year
Allowance for sales returns and price exceptions:
During year ended December 31, 2020	$	1,072	$	1,109	$	(1,775	)	$	406
During year ended December 31, 2019		373		2,939		(2,240	)		1,072
During year ended December 31, 2018		3,495		1,426		(4,548	)		373

Schedule of Property and Equipment Estimated Useful Lives

We record property and equipment at cost and depreciate it using the straight-line method over the estimated useful lives of the related assets. The useful lives are as follows:

Category	Useful Life
Laboratory equipment	3 to 10 years
Computer equipment and software	3 to 5 years
Furniture and fixtures	3 to 7 years
Equipment acquired under finance leases	3 to 7 years
Leasehold improvements	Shorter of remaining lease term or expected useful life