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The Company and Summary of Significant Accounting Policies - Additional Information (Details)		3 Months Ended		9 Months Ended
	Aug. 27, 2019	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accounting Policies [Abstract]
Reverse stock split	20
Maximum specific allowance as percentage of invoice value for problematic customer balances		100.00%		100.00%
Allowance for doubtful accounts receivable		$ 0		$ 0			$ 0
Inventory reserves		0	$ 100,000	$ 0	$ 100,000
Payment terms				The Company sells its products both directly to customers and through distributors generally under agreements with payment terms typically less than 60 days.
Deferred revenue, revenue recognized				$ 300,000
Impairment of goodwill		420,000	$ 3,159,000	420,000	$ 3,159,000
Goodwill balance		0		0			$ 420,000
Right-of-use lease asset		203,000		203,000		$ 400,000
Lease liabilities		$ 216,000		$ 216,000		$ 400,000

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Amount of allowance for credit loss on accounts receivable.

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