Commitments (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Purchase Commitment, Excluding Long-term Commitment [Line Items] | |||
| Commitment amount | $ 450,000 | ||
| Operating lease: | |||
| Lease expiration date | Mar. 31, 2025 | ||
| 2016 | $ 174,000 | ||
| 2017 | 180,000 | ||
| 2018 | 186,000 | ||
| 2019 | 191,000 | ||
| 2020 | 197,000 | ||
| Thereafter | 905,000 | ||
| Rent expense | $ 181,000 | $ 173,000 | $ 187,000 |