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Stockholders' Equity - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 9 Months Ended | 24 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Jul. 25, 2017 | May 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 05, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 05, 2018 | May 13, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of stock |  |  |  |  |  |  | $ 14,923,263 | $ 94,347,922 |  |
Warrants exercised (shares) |  |  |  | 284,091 | 0 |  | 284,091 | 0 |  |
Proceeds from warrant exercises |  |  |  | $ 902,000 |  |  | $ 902,000 |  |  |
Number of warrants outstanding (shares) |  |  |  | 0 |  |  | 0 |  |  |
Award vesting period |  |  |  |  |  |  | 3 years |  |  |
Maximum contractual term |  |  |  |  |  |  | 10 years |  |  |
Stock and Cash Based Incentive Plan |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, other shares, outstanding (shares) |  |  |  | 5,840,878 |  |  | 5,840,878 |  |  |
Award vesting period |  |  |  |  |  |  | 3 years |  |  |
Maximum contractual term |  |  |  |  |  |  | 10 years |  |  |
Number of shares of unvested restricted stock units (shares) |  |  |  |  |  |  | 176,330 |  |  |
2016 Incentive Plan |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares authorized (shares) |  |  |  | 8,000,000 |  |  | 8,000,000 |  |  | 6,000,000
Number of potential shares authorized for issuance under share based compensation plan (shares) |  |  |  |  |  |  |  |  |  | 2,000,000
Increase in number of shares authorized, share-based compensation arrangement (shares) | 2,000,000 |  |  |  |  |  |  |  |  |
Number of shares available for grant (shares) |  |  |  | 2,993,654 |  |  | 2,993,654 |  |  |
Number of shares of unvested restricted stock units and options outstanding (shares) |  |  |  | 1,534,883 |  |  | 1,534,883 |  |  |
Common stock, other shares, outstanding (shares) |  |  |  | 3,104,397 |  |  | 3,104,397 |  |  |
Common Stock | Sales Agreement |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum authorized amount |  |  | $ 100,000,000.0 |  |  |  |  |  |  |
Agent fee |  |  | 3.00% |  |  |  |  |  |  |
Aggregate number of shares issued (shares) |  |  |  |  |  |  | 2,652,530 |  |  |
Common shares sold (dollars per share) |  |  |  | $ 5.14 |  |  | $ 5.14 |  |  |
Aggregate proceeds |  |  |  |  |  |  | $ 13,400,000 |  |  |
Remaining authorized amount |  |  |  | $ 86,400,000 |  |  | 86,400,000 |  |  |
Proceeds from issuance of stock |  |  |  |  |  |  | $ 14,900,000 |  |  |
Common Stock | ATM Sales Agreement |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate number of shares issued (shares) |  |  |  |  |  | 314,950 |  | 2,937,406 | 3,911,104 |
Common shares sold (dollars per share) |  |  |  |  | $ 8.41 | $ 5.07 |  | $ 8.41 | $ 5.07 |
Aggregate proceeds |  |  |  |  |  | $ 1,600,000 |  | $ 24,200,000 | $ 32,100,000 |
Common Stock | Public Offering, Not IPO |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common shares sold (dollars per share) |  | $ 6.00 |  |  |  |  |  |  |  |
Number of common shares sold (shares) |  | 12,500,000 |  |  |  |  |  |  |  |
Proceeds from issuance of stock |  | $ 70,100,000 |  |  |  |  |  |  |  |

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