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Warrant Liability - Narrative (Details) - USD ($) |  |  |  | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 15, 2017 | Feb. 14, 2017 | Feb. 09, 2017 | May 02, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | May 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock issued for cash, IPO |  |  | 3,710,000 |  |  |  |
Shares issued, price per share (in dollars per share) |  |  |  |  | $ 1.35 | $ 3.00 |
Warrants, exercise price (in dollars per share) |  |  |  |  |  |  | $ 7.50
Additional shares available for purchase |  |  |  |  | 835,000 | 460,000 |
Class of warrants aggregate amounts (in shares) |  |  |  |  |  |  | 107,802
Proceeds from issuance, IPO |  |  |  |  | $ 6,071,000 | $ 9,170,000 |
Series C warrants vested (in shares) |  |  |  | 234,297 |  |  |
Change in fair value of warrant liability | $ 1,240,000 |  |  |  | $ 2,548,000 | $ 0 |
Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) |  |  | $ 1.35 |  |  |  |
Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) |  |  | $ 1.50 |  |  |  |
Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock issued for cash, IPO |  |  |  |  |  | 1,540,026 |
Common stock offered for each warrant (in shares) |  |  | 1 |  |  |  |
Warrant |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Warrants granted |  | 8,235,923 |  |  | 8,235,923 |  |
Number of shares under warrant, exercised |  |  |  |  | 2,728,434 |  |
Series A Warrant |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Warrant term |  |  | 5 years |  |  |  |
Class of warrants aggregate amounts (in shares) |  |  | 278,250 |  |  |  |
Number of shares under warrant, exercised |  |  |  |  | 1,833,984 |  |
Series A Warrant | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock offered for each warrant (in shares) |  |  | 0.50 |  |  |  |
Series B Warrant |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Warrant term |  |  | 90 days |  |  |  |
Warrants, exercise price (in dollars per share) |  |  | $ 1.35 |  |  |  |
Class of warrants aggregate amounts (in shares) |  |  | 556,500 |  |  |  |
Number of shares under warrant, exercised |  |  |  |  | 596,300 |  |
Expired Series B and Series C warrants (in shares) | 5,087,717 |  |  |  |  |  |
Series B Warrant | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock offered for each warrant (in shares) |  |  | 1 |  |  |  |
Series C Warrant |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Warrant term |  |  | 5 years |  |  |  |
Class of warrants aggregate amounts (in shares) |  |  | 278,250 |  |  |  |
Number of shares under warrant, exercised |  |  |  |  | 298,150 |  |
Series C warrants vested (in shares) |  |  |  |  | 298,150 |  |
Series C Warrant | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock offered for each warrant (in shares) |  |  | 0.50 |  |  |  |
Series A and Series C Warrants |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Warrants, exercise price (in dollars per share) |  |  | $ 1.50 |  |  |  |
Underwriting Agreement |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Warrants, exercise price (in dollars per share) |  |  | $ 0.001 |  |  |  |
Additional shares available for purchase |  |  | 556,500 |  |  |  |
Price per share of common stock issued (in dollars per share) |  |  | $ 1.349 |  |  |  |
Warrants exercised |  |  | $ 278,100 |  |  |  |
Proceeds from issuance, IPO |  |  | $ 4,500,000 |  |  |  |

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