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Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2012 | Oct. 31, 2011 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Apr. 30, 2011
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  | 225,000,000 |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  | $ 0.001 |
Change in fair value of redeemable convertible preferred stock warrant liability |  |  | $ 200 | $ 0 | $ 327 |  |  |
Warrant To Purchase Series B Redeemable Preferred Stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares subject to purchase from warrant (in shares) | 23,760 | 94,510 |  |  |  |  |  | 59,140
Proceeds from drawdown | $ 400 | $ 1,600 |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  |  |  |  |  | $ 0.34
Class B common stock |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Number of shares issued from exercise of warrants (in shares) |  |  |  |  |  | 174,347 |  |

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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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