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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019 | Sep. 05, 2018 | Dec. 31, 2017 | Aug. 29, 2015
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Depreciation, Depletion and Amortization | $ 240,000 | $ 272,000 |  |  |  |
Cash and Cash Equivalents, at Carrying Value. | $ 15,045,000 | 28,918,000 |  |  | $ 17,116,000 |
Equity Method Investment, Ownership Percentage | 83.00% |  |  |  |  |
Accrued Liabilities | $ 700,000 | 700,000 |  |  |  |
Prepaid Expense | 48,000 | 0 |  |  |  |
preferred stock accrued dividends | 248,000 | 243,000 |  |  |  |
Net Loss Attributable to Non-controlling Interest | $ (77,000) | $ (54,000) |  |  |  |
Preferred Stock Shares Converted | 1,523 | 6,562 |  |  |  |
Right of Use Asset | $ 419,000 | $ 0 | $ 537,000 |  |  |
Operating Lease Liability | $ 249,000 | $ 0 | $ 939,000 |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 6,641,736 | 7,966,057 |  |  |  |
preferred stock accrued dividends | $ 525,000 | $ 11,681,000 |  |  |  |
Accretion of Preferred Stock Deemed Dividend |  | 9,200,000 |  |  |  |
Net Loss Attributable to Non-controlling Interest | 0 | 0 |  |  |  |
Accretion of preferred discount | 525,000 | 2,500,000 |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
preferred stock accrued dividends | $ 248,000 | $ 243,000 |  |  |  |
Accretion of preferred discount |  |  |  |  | $ 6,900,000 |
Warrant [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 18,714,999 | 18,915,850 |  |  |  |
Options [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 2,502,012 | 938,982 |  |  |  |
Money Market Accounts [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and Cash Equivalents, at Carrying Value. | $ 98,000 | $ 98,000 |  |  |  |
SYN Biomics [Member] |  |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 83.00% |  |  | 88.50% |  |
Noncontrolling Interest, Ownership Percentage by Parent | 17.00% |  |  | 11.50% |  | 8.50%
Net Loss Attributable to Non-controlling Interest | $ 2,900,000 | $ 2,900,000 |  |  |  |

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