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The Company and Summary of Significant Accounting Policies - Summary of Impact of Adoption of Accounting Standards on Consolidated Balance Sheet (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Accounts receivable, net	$ 1,175,000	$ 1,622,000	$ 1,681,000
Stockholders’ equity
Accumulated deficit	$ (238,447,000)	(235,867,000)	(224,688,000)
Adjustments Due to ASC 606 | ASC 606
Assets
Accounts receivable, net		(220,000)	230,000
Stockholders’ equity
Accumulated deficit		(220,000)	230,000
Balances without Adoption of ASC 606 | ASC 606
Assets
Accounts receivable, net		1,402,000	1,911,000
Stockholders’ equity
Accumulated deficit		$ (236,087,000)	$ (224,458,000)

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