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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Operating Leased Assets [Line Items] |  |  |
Restricted cash | $ 208 |  | $ 207
Remaining Aggregate Annual Commitments [Abstract] |  |  |
2018 (remaining nine months) | 641 |  |
2019 | 874 |  |
2020 | 897 |  |
2021 | 718 |  |
2022 | 445 |  |
Thereafter | 74 |  |
Total | $ 3,649 |  |
Office Space in New York [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
LOC expiration date | Oct. 29, 2020 |  |
Number of days written notice | 90 days |  |
Rent expense | $ 140 | $ 139 |
Lease expiration date | Feb. 28, 2023 |  |
Inotek Former Headquarters [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Rent expense | $ 83 |  |

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