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Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2020

Balance Sheet Related Disclosures [Abstract]

Accounts Receivable, Net

Accounts receivable consists of the following:

			December 31,
			2020						2019
Accounts receivable, gross			$	4,713					$	10,938
Allowance for doubtful accounts			(41)						(23)
Accounts receivable, net			$	4,672					$	10,915

Allowance for Doubtful Accounts

The following is a summary of the change in our allowance for doubtful accounts:

			Year Ended December 31,
			2020						2019
Balance at beginning of year			$	23					$	21
Additions charged			18						2
Balance at end of year			$	41					$	23

Inventories

Inventories consist of the following:

			December 31,
			2020						2019
Finished goods			$	1,775					$	1,630
Work-in-process			670						3,771
Inventories			$	2,445					$	5,401

Property and Equipment, Net

Property and equipment consists of the following:

			December 31,
			2020						2019
Equipment, furniture and fixtures			$	8,889					$	8,494
Tooling			6,298						6,552
Software			5,711						6,428
Leasehold improvements			1,393						1,392
			22,291						22,866
Accumulated depreciation and amortization			(17,188)						(18,258)
Property and equipment, net			$	5,103					$	4,608

Schedule of Finite-Lived Intangible Assets

Acquired intangible assets resulting from this transaction consist of the following:

			December 31,
			2020						2019
Developed technology			$	5,050					$	5,050
Customer relationships			1,270						1,270
Backlog and tradename			410						410
			6,730						6,730
Less: accumulated amortization			(5,523)						(4,026)
Acquired intangible assets, net			$	1,207					$	2,704

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

As of December 31, 2020, future estimated amortization expense is as follows:

Years ending December 31:
2021			$	1,117
2022			90
			$	1,207

Accrued Liabilities and Current Portion of Long-Term Liabilities

Accrued liabilities and current portion of long-term liabilities consist of the following:

			December 31,
			2020						2019
Accrued payroll and related liabilities			$	2,867					$	3,440
Operating lease liability, current			2,039						1,545
Current portion of accrued liabilities for asset financings			786						483
Accrued costs related to restructuring			630						66
Accrued commissions and royalties			474						663
Accrued interest payable			429						397
Deferred revenue			179						146
Other			2,048						1,952
Accrued liabilities and current portion of long-term liabilities			$	9,452					$	8,692

Liability for Deferred Revenue

The following is a summary of the change in deferred revenue:

			Year Ended December 31,
			2020						2019
Deferred revenue:
Balance at beginning of period			$	146					$	96
Revenue deferred			935						511
Revenue recognized			(902)						(461)
Balance at end of period			$	179					$	146

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