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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, 2018 | Dec. 31, 2017
--- | --- | ---
ASSETS |  |
Accounts receivable, net | $ 1,622,000 | $ 1,681,000
Stockholders’ equity |  |
Accumulated deficit | (235,867,000) | (224,688,000)
Adjustments Due to ASC 606 | ASU 2014-09 |  |
ASSETS |  |
Accounts receivable, net | (220,000) | 230,000
Stockholders’ equity |  |
Accumulated deficit | (220,000) | 230,000
Balances without Adoption of ASC 606 | ASU 2014-09 |  |
ASSETS |  |
Accounts receivable, net | 1,402,000 | 1,911,000
Stockholders’ equity |  |
Accumulated deficit | $ (236,087,000) | $ (224,458,000)

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