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Effects of Adopting ASU Topic 606, Balance Sheet Highlights (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Current liabilities [Abstract] |  |  |  |
Deferred revenue, current portion | $ 0 | $ 1,500 |  |
Total current liabilities | 1,863 | 4,482 |  |
Deferred revenue, non-current portion | 0 | 1,000 |  |
Total liabilities | 1,863 | 5,622 |  |
Accumulated deficit | (198,422) | (175,516) |  |
Total stockholders' equity | 9,888 | 1,553 | $ 11,147 | $ 15,095
Pre-Topic 606 [Member] |  |  |  |
Current liabilities [Abstract] |  |  |  |
Deferred revenue, current portion | 1,000 | 1,500 |  |
Total current liabilities | 2,863 | 4,482 |  |
Deferred revenue, non-current portion |  | 1,000 |  |
Total liabilities | 2,863 | 5,622 |  |
Accumulated deficit | (199,422) | (175,516) |  |
Total stockholders' equity | 8,888 | 1,553 |  |
Post-Topic 606 [Member] |  |  |  |
Current liabilities [Abstract] |  |  |  |
Deferred revenue, current portion | 0 | 0 |  |
Total current liabilities | 1,863 | 2,982 |  |
Deferred revenue, non-current portion |  | 0 |  |
Total liabilities | 1,863 | 3,122 |  |
Accumulated deficit | (198,422) | (173,016) |  |
Total stockholders' equity | 9,888 | 4,053 |  |
Adjustment [Member] | Effects of Adopting Topic 606 [Member] | ASU Topic 606 [Member] |  |  |  |
Current liabilities [Abstract] |  |  |  |
Deferred revenue, current portion | (1,000) | (1,500) |  |
Total current liabilities | (1,000) | (1,500) |  |
Deferred revenue, non-current portion |  | (1,000) |  |
Total liabilities | (1,000) | (2,500) |  |
Accumulated deficit | 1,000 | 2,500 |  |
Total stockholders' equity | $ 1,000 | $ 2,500 |  |

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