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v3.20.1

Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2020 | Aug. 09, 2019 | Mar. 28, 2019 | Aug. 06, 2018 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 22, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issued (in shares) |  |  |  | 12,062,000 |  |  |  |
Number of additional shares from warrants (in shares) |  |  | 2,500,000 | 4,221,700 | 1,255,129 | 1,255,129 |  |
Gross proceeds |  |  |  | $ 19,700 |  |  |  |
Exercise price per share (in dollars per share) |  |  | $ 7.00 | $ 2.52 |  |  |  |
Stock issuance costs |  |  |  | $ 500 |  | $ 0 | $ 500 |
Proceeds from the exercise of warrants |  |  | $ 10,600 |  | $ 6,900 | $ 17,542 | $ 0 |
Preferred stock, shares authorized (in shares) |  |  |  |  | 2,000,000 | 2,000,000 | 2,000,000 |
Preferred stock, par value (in dollars per share) |  |  |  |  | $ 0.001 | $ 0.001 | $ 0.001 |
Preferred stock, shares outstanding (in shares) |  |  |  |  | 0 | 0 | 0 |
Number of rights issued per common stock (in shares) |  |  |  |  |  |  |  | 1
Gross proceeds received from issuance of Series E preferred stock |  |  |  |  |  | $ 10,000 | $ 0 |
Dividends accrued |  |  |  |  | $ 400 | $ 400 |  |
Percent threshold for acquiring common stock in order to remain Grandfathered Stockholders |  |  |  |  |  | 0.50% |  |
Series D Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Exercise price per share (in dollars per share) |  |  |  |  |  |  |  | $ 10.00
Preferred stock, shares authorized (in shares) |  |  |  |  | 150,000 | 150,000 |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  | $ 0.001
Number of preferred shares issued from exercise of right (in shares) |  |  |  |  |  |  |  | 0.001
Series E Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  | 39,500 | 39,500 |  |
Preferred stock, par value (in dollars per share) |  | $ 0.001 |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  | 10,000 |  |  |  |  |  |
Gross proceeds received from issuance of Series E preferred stock |  | $ 10,000 |  |  |  |  |  |
Dividend rate |  | 9.00% |  |  |  |  |  |
Redemption price |  | 110.00% |  |  |  |  |  |
Liquidation preference per share (in dollars per share) |  | $ 1,000 |  |  |  |  |  |
Subsequent Event | Series E Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) | 25,000 |  |  |  |  |  |  |
Purchase price (in dollars per share) | $ 1,000 |  |  |  |  |  |  |
Gross proceeds received from issuance of Series E preferred stock | $ 25,000 |  |  |  |  |  |  |

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