Stockholders' Equity (Details) - USD ($) |
1 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2016 |
Sep. 30, 2015 |
May 15, 2015 |
|
| Class of Stock [Line Items] | ||||
| Stock issued during period, shares, new issues (in shares) | 2,340,980 | |||
| Common stock, par value, average (usd per share) | $ 2.68 | $ 2.68 | ||
| Proceeds from issuance of common stock | $ 6,300,000 | |||
| Proceeds from sale of common stock, net of underwriting discounts and issuance cost | 5,996,000 | $ 2,480,000 | ||
| At the Market Issuance Sales Agreement [Member] | Cowen [Member] | ||||
| Class of Stock [Line Items] | ||||
| Common stock remained available to be sold under the sales agreement | $ 15,000,000 | $ 15,000,000 | $ 25,000,000 | |
| Common stock | ||||
| Class of Stock [Line Items] | ||||
| Stock issued during period, shares, new issues (in shares) | 15,753 | |||
| Exercise price of warrants (usd per share) | $ 0.67 | $ 0.67 | ||