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Common Stock (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) Vote $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Aug. 31, 2018 USD ($) | Jul. 30, 2018 USD ($) | Mar. 08, 2018 USD ($) | Aug. 31, 2015 USD ($)
Common Stock [Abstract] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares | 100,000,000 | 100,000,000 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.0001 | $ 0.0001 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |
Common stock, voting rights | Each share of common stock has the right to one vote |  |  |  |  |  |
Number of votes entitled to each share of common stock | Vote | 1 |  |  |  |  |  |
Common stock, shares authorized (in shares) | shares | 100,000,000 |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.0001 |  |  |  |  |  |
Number of shares of common stock sold (in shares) | shares | 7,510,555 | 730,444 | 4,760,594 |  |  |  |
Universal Shelf Registration Statement [Member] | Common Stock [Member] | Maximum [Member] |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |
Securities offered for sale, aggregate value |  |  |  |  | $ 100,000 |  | $ 100,000
ATM Agreement [Member] | Common Stock [Member] |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |
Aggregate value of common stock available for offer and sale | $ 37,458 |  |  |  |  |  |
Number of shares of common stock sold (in shares) | shares | 7,510,555 | 730,444 | 4,760,594 |  |  |  |
Average sales price per common share (in dollars per share) | $ / shares | $ 3.71 | $ 5.19 | $ 4.16 |  |  |  |
Aggregate proceeds from sales of common stock | $ 27,837 | $ 3,790 | $ 19,791 |  |  |  |
Sales commissions, fees and other costs associated with issuance of common stock | $ 785 | $ 113 | $ 594 |  |  |  |
ATM Agreement [Member] | Common Stock [Member] | Maximum [Member] |  |  |  |  |  |  |
Common Stock [Abstract] |  |  |  |  |  |  |
Securities offered for sale, aggregate value |  |  |  | $ 50,000 |  | $ 50,000 | $ 35,000

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