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Common Stock - Public Offering (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended
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Jun. 25, 2020 USD ($) shares | Jun. 22, 2020 $ / shares shares | Jul. 11, 2019 USD ($) $ / shares shares | Feb. 05, 2019 USD ($) item $ / shares shares | Dec. 31, 2020 USD ($) Vote $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.001 | $ 0.001
Issuance of common stock (value) | $ |  |  |  | $ 12,122 |  | $ 12,122
Common stock issued | shares |  |  |  | 7,557,142 |  |
Price per share (in dollars per share) | $ / shares |  |  |  | $ 1.75 |  |
Proceeds from issuance of common stock from ATM sales | $ |  |  |  |  |  | 1,923
Proceeds from issuance of common stock in connection with July 2019 Lincoln Park Capital Registered Offering Purchase Agreement, net of issuance costs | $ |  |  |  |  |  | 1,000
Number of Vote on Common Shares | Vote |  |  |  |  | 1 |
Dividends, Common Stock | $ |  |  |  |  | $ 0 |
2019 Warrants |  |  |  |  |  |
Exercise price of warrant | $ / shares |  |  |  | $ 1.95 |  |
Warrant to purchase shares of common stock | shares |  |  |  | 7,557,142 |  |
Warrants and Rights Outstanding, Term |  |  |  | 7 years |  |
Number of share for warrant to purchase of common stock | item |  |  |  | 1 |  |
June 2020 Warrants |  |  |  |  |  |
Exercise price of warrant | $ / shares |  | $ 0.001 |  |  |  |
Warrant to purchase shares of common stock | shares |  | 2,250,000 |  |  |  |
Distribution Agreement |  |  |  |  |  |
Common stock issued | shares |  |  |  |  | 1,033,147 |
Commons Stock Value Maximum Right To Sell | $ |  |  |  |  | $ 30,000 |
Proceeds from issuance of common stock from ATM sales | $ |  |  |  |  | $ 1,923 |
Lincoln Park Purchase Agreements |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.001 |  |  |
Common stock issued | shares |  |  | 571,429 |  |  |
Price per share (in dollars per share) | $ / shares |  |  | $ 1.75 |  |  |
Commons Stock Value Maximum Right To Sell | $ |  |  | $ 20,000 |  |  |
Stock Issued During Period, Shares, Issued for Services | shares |  |  | 330,000 |  |  |
Proceeds from issuance of common stock in connection with July 2019 Lincoln Park Capital Registered Offering Purchase Agreement, net of issuance costs | $ |  |  | $ 1,000 |  |  |
Underwriters' exercise |  |  |  |  |  |
Common stock issued | shares |  |  |  | 985,714 |  |
Common Stock |  |  |  |  |  |
Issuance of common stock (value) | $ |  |  |  |  |  | $ 7
Common stock issued | shares |  |  |  |  |  | 7,557,142
Common Stock | June 2020 Warrants |  |  |  |  |  |
Common stock issued | shares |  | 20,250,000 |  |  |  |
Share Price | $ / shares |  | $ 2.00 |  |  |  |
Net proceeds from issuance of common stock | $ | $ 48,276 |  |  |  |  |
Common Stock | Underwriters' exercise | June 2020 Warrants |  |  |  |  |  |
Common stock issued | shares | 3,375,000 |  |  |  |  |

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