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Supplemental Consolidated Financial Statement Information – Impact of Adoption of Topic 606 on Consolidated Balance Sheets (Details) - USD ($) | May 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Common stock dividend declared, percentage of shares outstanding | 5.00% |  |  |
Current assets: |  |  |  |
Accounts receivable, net |  | $ 25,338,000 | $ 33,156,000 | $ 16,280,000
Prepaid expenses and other current assets |  | 12,311,000 | 7,340,000 | 7,362,000
Current liabilities: |  |  |  |
Accounts payable |  | 5,427,000 | 5,933,000 | 5,586,000
Deferred revenue |  | 10,501,000 | 6,314,000 | 5,385,000
Stockholders' equity: |  |  |  |
Common Stock |  | 230,000 | 229,000 | 228,000
Additional paid-in capital |  | 153,268,000 | 152,022,000 | 151,185,000
Retained deficit |  | $ (34,518,000) | (10,153,000) | 21,657,000
Stock Dividend Adjustments |  |  |  |
Stockholders' equity: |  |  |  |
Common Stock |  |  | 11,000 | 11,000
Additional paid-in capital |  |  | 8,187,000 | 8,187,000
Retained deficit |  |  | (8,198,000) | (8,198,000)
ASU 2014-09 | As Previously Reported |  |  |  |
Current assets: |  |  |  |
Accounts receivable, net |  |  | 33,138,000 | 16,031,000
Prepaid expenses and other current assets |  |  | 4,677,000 | 4,822,000
Current liabilities: |  |  |  |
Accounts payable |  |  |  | 5,617,000
Deferred revenue |  |  | 3,699,000 | 3,155,000
Stockholders' equity: |  |  |  |
Common Stock |  |  | 218,000 | 217,000
Additional paid-in capital |  |  | 143,835,000 | 142,998,000
Retained deficit |  |  | (2,021,000) | 29,265,000
ASU 2014-09 | Adjustments |  |  |  |
Current assets: |  |  |  |
Accounts receivable, net |  |  | 18,000 | 249,000
Prepaid expenses and other current assets |  |  | 2,663,000 | 2,540,000
Current liabilities: |  |  |  |
Accounts payable |  |  |  | (31,000)
Deferred revenue |  |  | 2,615,000 | 2,230,000
Stockholders' equity: |  |  |  |
Retained deficit |  |  | $ 66,000 | $ 590,000

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