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Subsequent Event - Additional Information (Details) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 21, 2020 | Jun. 22, 2020 | Jun. 21, 2019 | Jun. 28, 2020 | Jun. 30, 2019 | [1] | Jun. 28, 2020 | Jun. 30, 2019
Subsequent Event [Line Items] |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  | $ 7,900,000 | $ 8,000,000.0 |  |  | $ 7,847,000 | $ 8,548,000
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Net proceeds from issuance of common stock | $ 461,000 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Aggregate shares of common stock issued |  |  |  | 2,500,000 | 1,314,000 |  |
Exercise of Option for Overallotment of Shares by Underwriters | Common Stock |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Aggregate shares of common stock issued |  | 375,000 | 171,429 |  |  |  |
Exercise of Option for Overallotment of Shares by Underwriters | Common Stock | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Aggregate shares of common stock issued | 141,733 |  |  |  |  |  |
[1] | Common stock shares and additional paid-in capital amounts as of December 31, 2018, and in the three-months ended March 31, 2019 and June 30, 2019 are adjusted to reflect 1-for-14 reverse stock split effected on December 23, 2019.

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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