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Balance Sheet Components (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Inventories:
Work-in-process	$ 3,092	$ 2,894
Finished goods	998	665
Inventories	4,090	3,559
Other current assets:
Prepaid expenses	853	836
Other	234	161
Other current assets	1,087	997
Property and equipment:
Property and equipment, gross	14,213	14,855
Less: Accumulated depreciation and amortization	(12,525)	(12,480)
Property and equipment, net	1,688	2,375
Accrued liabilities:
Employee related accruals	1,541	1,143
Other	677	510
Accrued liabilities	2,218	1,653
Equipment
Property and equipment:
Property and equipment, gross	10,700	10,996
Software
Property and equipment:
Property and equipment, gross	2,788	3,139
Furniture and fixtures
Property and equipment:
Property and equipment, gross	42	46
Leasehold improvements
Property and equipment:
Property and equipment, gross	$ 683	$ 674

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