Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Quarterly Financial Information Disclosure [Abstract] | ||||||||||||||
| Revenue | $ 7,121 | $ 7,223 | $ 6,903 | $ 6,767 | $ 6,791 | $ 6,612 | $ 6,345 | $ 5,408 | $ 28,014 | $ 25,156 | ||||
| Loss from operations | (3,293) | (2,941) | (3,406) | (6,336) | (8,193) | (7,543) | (7,702) | (8,071) | (15,976) | (31,509) | ||||
| Net loss | $ (4,340) | $ (3,982) | $ (4,344) | $ (7,254) | $ (8,925) | $ (8,064) | $ (8,072) | $ (8,168) | $ (19,920) | $ (33,229) | ||||
| Weighted average number of shares outstanding, basic | 5,360,000 | 5,335,000 | 4,485,000 | 3,383,000 | 3,376,000 | 3,373,000 | 3,366,000 | 3,364,000 | 4,647,983 | [1] | 3,369,808 | [1] | ||
| Net loss per common share basic | $ (0.81) | $ (0.75) | $ (0.97) | $ (2.14) | $ (2.64) | $ (2.39) | $ (2.40) | $ (2.43) | $ (4.29) | [1] | $ (9.86) | [1] | ||
| Weighted average number of shares outstanding diluted | 5,360,000 | 5,335,000 | 4,485,000 | 3,383,000 | 3,376,000 | 3,377,000 | 3,370,000 | 3,369,000 | 4,647,983 | [1] | 3,373,180 | [1] | ||
| Net loss per common share diluted | $ (0.81) | $ (0.75) | $ (0.97) | $ (2.14) | $ (2.64) | $ (2.39) | $ (2.39) | $ (2.42) | $ (4.29) | [1] | $ (9.92) | [1] | ||
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