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Equity - Narrative (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Aug. 31, 2020 shares | Aug. 03, 2020 shares | Jul. 13, 2020 shares | May 24, 2020 shares | May 15, 2020 shares | Apr. 21, 2020 director shares | Jan. 10, 2020 shares | Jan. 01, 2020 USD ($) shares | Sep. 04, 2019 shares | Aug. 16, 2019 shares | Jul. 21, 2019 $ / shares shares | Jan. 04, 2019 shares | Dec. 07, 2016 shares | Jul. 21, 2014 shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 | 100,000,000
Common stock, par or stated value per share (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001
Proceeds from contributions to employee stock purchase plan | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 191,000 | $ 0
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,068,000 | $ 1,766,000
Restated 2016 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of directors | director |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |
Increase in number of shares that may be issued (in shares) |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be issued (in shares) |  |  |  | 1,650,000 |  |  |  |  |  |  |  |  |  |  |  |
UPOs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options issued (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 |  |
Number of cashless options exercised (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 282,900 |  |  |
Number of rights (in shares) |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of warrants exercised (in shares) |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Number of warrants per each share of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 0.50 |  |  |  |  |
Warrant exercise price (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 11.50 |  |  |  |  |
Number of rights per each share of common stock (in shares) |  |  |  |  |  |  |  |  |  |  | 0.10 |  |  |  |  |
Service-based RSUs | Restated 2016 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 275,133 | 274,851
Service-Based RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 178,633 | 268,851
Vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |
Service-Based RSUs | Restated 2016 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock issued (in shares) |  |  |  |  | 54,180 | 5,334 | 97,571 |  | 40,993 | 4,832 |  | 50,222 |  |  |  |
Service-Based RSUs | Restated 2016 Plan | Former Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock issued (in shares) | 10,000 |  |  |  |  |  | 7,334 |  |  |  |  |  |  |  |  |
Employee stock purchase plan | ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock issued (in shares) |  | 472 | 30,353 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized to be issued (in shares) |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |
Purchase price of common stock, percent of fair market value |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |
Maximum contribution percentage |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |
Maximum contribution amount | $ |  |  |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |  |
Offering period |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |
Discount percentage from market price, beginning of purchase period |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |  |
Proceeds from contributions to employee stock purchase plan | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 |
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 34,000 |
Redeemable Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 1,000,000
Preferred stock, par value (in usd per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001
Common Stock | UPOs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock issued (in shares) |  |  |  |  |  |  |  |  |  |  | 1 |  | 121,173 |  |  |

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