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The Company, Accounting Pronouncements Recently Adopted (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Assets and Liabilities, Lessee [Abstract] |  |  |  |
Right-of-use assets | $ 755 |  | $ 0 |
Lease liabilities | 772 |  |  |
Statement of Operations [Abstract] |  |  |  |
Change in fair value of warrant liability gain (loss) | $ 0 | $ (1) |  |
ASU 2016-02 [Member] |  |  |  |
Assets and Liabilities, Lessee [Abstract] |  |  |  |
Right-of-use assets |  |  | 848 |
Lease liabilities |  |  | $ 848 |
ASU 2017-11 [Member] |  |  |  |
Net Assets, Adjusted Balance [Abstract] |  |  |  |
Cumulative accounting adjustment from adoption of new standard, net of tax |  |  |  | $ 67
Statement of Operations [Abstract] |  |  |  |
Change in fair value of warrant liability gain (loss) |  | 1 |  |
Balance Sheet [Abstract] |  |  |  |
Fair value of warrant liability |  | 2 |  |
ASU 2017-11 [Member] | Balances prior to Adoption of ASU 2017-11 |  |  |  |
Statement of Operations [Abstract] |  |  |  |
Change in fair value of warrant liability gain (loss) |  | 40 |  |
Balance Sheet [Abstract] |  |  |  |
Fair value of warrant liability |  | 24 |  |
ASU 2017-11 [Member] | Effect of Adoption Higher / (Lower) [Member] |  |  |  |
Statement of Operations [Abstract] |  |  |  |
Change in fair value of warrant liability gain (loss) |  | (39) |  |
Balance Sheet [Abstract] |  |  |  |
Fair value of warrant liability |  | $ (22) |  |
ASU 2017-11 [Member] | Accumulated Deficit [Member] |  |  |  |
Net Assets, Adjusted Balance [Abstract] |  |  |  |
Cumulative accounting adjustment from adoption of new standard, net of tax |  |  |  | (2,547)
ASU 2017-11 [Member] | Additional Paid-In Capital [Member] |  |  |  |
Net Assets, Adjusted Balance [Abstract] |  |  |  |
Cumulative accounting adjustment from adoption of new standard, net of tax |  |  |  | $ 2,614

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